Find the product. -5x(2x + 2x7)

The correct answer is 3.5.

Let t be the amount of time each steamer takes.

Two steamers that are headed in opposite directions depart a port on a river at the same time, according to the information provided.

Given that both steamers move at the same speed, they would cover the same distance in t hours.

Given that both steamers covered 140 miles, we can write the following equation to reflect this data:

                              rate             time                distance

First stream            20               t                       20t

Second stream      20               t                       20t

                                                                           140

setting the equation ,

20t + 20t = 140

40t = 140

t = 140/40

t = 3.5

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Answer: $127

Step-by-step explanation: $81.75+$45.25=$127

Answer:

Step-by-step explanation:

The exponent is -3, making it 10 to the power of negative 3. When an exponent is negative, the solution is a number less than the origin or base number. To find our answer, we move the decimal to the left 3 times:

9.2 -> 0.0092

The answer is D.

Answer:

0.0092.

Step-by-step explanation:

I have an explanation on this same question. Apparently, you have a duplicate of this.

Answer:

Sue Black: 40 hours, $270

Jerry Atrix: 30 hours, $154.50

Sam Ting: 38.75 hours, $339.06

Step-by-step explanation:

Firstly, 40 hours is a workweek of 8-hour shifts. It's good to remember. Otherwise, we can multiply 8 by 5 and get 40 anyway. That's the hours of Sue Black, and she earns:

40*$6.75 = $270

Jerry worked for (note you can easily add in memory if you do the fractions first):

7.25+3+6.75+8+5 = 7.25+6.75 + 3+8+5 = 14 + 16 = 30

Earnings:

30*$5.15 = $154.50

Sam worked a quarter of an hour less than Sue each day. That means that his total time was:

40 - 5 * 0.25 = 40 - 1.25 = 38.75

Earnings:

38.75*$8.75 = $339.0625 ≈$339.06

Answer:

the answer is y=3x - 9

Step-by-step explanation:

From y=mx+c

;m=3 (slope)

Therefore y=3x+c

SOLVING FOR C

y=3x+c

From (2,-3)

x=2

y=-3

-3=3(2)+c

-3=6+c

SUBTRACTING (6) FROM BOTH SIDES

-3-(6)=6-(6)+c

-3-(6)=0+c

c= -3-(6)

c=-9

THEREFORE THE EQUATION OF THE LINE IS

y=3x-9

Answer:

C intercept is 800, n intercept is -3.3333...

Step-by-step explanation:

C = 240n + 800 is a linear equation (the graph is a line)

C-intercept is the point with the coordinates ( 0, C-intercept ) where the line C = 240n + 800 is intersecting the vertical C-axis and

n-intercept is the point with the coordinates (n-intercept, 0) where the line C = 240n + 800 is intersecting the horizontal n-axis.

Find the C-intercept:

n has to be 0 for our line to intercept the C-axis, so substitute n = 0 in our given equation

C = 240n + 800

C = 240·0 + 800

C = 800

Find the n-intercept:

C has to be 0 for our line to intercept the n-axis, so substitute C = 0 in our given equation

C = 240·n + 800

0 = 240·n + 800, subtract 800 from both sides

-800 = 240 ·n, divide both sides by 240

-800/240 = n

-3.(3) = n

Step-by-step explanation:

I guess the result is needed again in slope-intercept form.

this is in general

y = ax + b

"a" being the slope, "b" being the y-intercept (y value when x = 0).

when a line is parallel to another line, this means they both have the same slope.

so, we can use the same "a" from the original line : -1

to get "b" we use the given point coordinates :

5 = -1×-3 + b = 3 + b

2 = b

so, the full equation is

y = -x + 2

Answer:

13

Step-by-step explanation:

u multiply 4.50 x 3 it makes it 13.5 so they basically need to pay more .

Step-by-step explanation:

1 pound is equivalent to 3500 calories.

if you burn 450 more calories per day, it will take as many days as the times 450 fits into 3500 :

3500 / 450 = 7.77777777... days

for 10 pounds we need to burn 10×3500 = 35000 calories.

35000 / 450 = 77.77777777... days (10 times more logically than for 1 pound).

Correct answer is B. In A, there is no number from which to regroup (all the numbers may be added together), so you must regroup. In B, the number 6 cannot be added to the number 2, therefore you must regroup.

Making groups of ten while doing math operations like addition or subtraction is known as regrouping. This frequently occurs while dealing with double digits. Technically speaking, it also happens whenever you get a response that is more than 10.

Additionally, if the numbers you are adding result in a two-digit number and they are not in the farthest left column, you must regroup. When the numbers you are subtracting from are more than the ones you are subtracting from, you regroup.

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The missing value in the table below assuming a linear relationship is 18

The table of values represents the given parameters

From the question, we understand that the relationship is a linear relationship.

This means that the x and y values change at constant rate

From the table, we have

As x increases by 1, y increases by 2

So, the missing value is

Missing value = 16 + 2

Evaluate

Missing value = 18

Hence, the missing value in the table below assuming a linear relationship is 18

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Answer:

24

Step-by-step explanation:

Because 300 cookies / 38 cookies = 7.89,..

Then 7.89,... x 3 = 23.68,...

round to the nearest tenths= 24

In order to meet the demand for the bake sale, a total of 300 cookies will be prepared, requiring the use of precisely 24 fresh eggs.

To calculate how many eggs you need to make 300 cookies, set up a proportion based on the information given in the cookie recipe:

Number of eggs / Number of cookies = Constant ratio

Let the number of eggs needed for 300 cookies as "x."

So,  x eggs / 300 cookies = 3 eggs / 38 cookies

Now, cross-multiply and solve for "x":

x * 38 = 3 * 300

38x = 900

x = 900 / 38

x = 23.6842

x ≈ 24

Therefore, you need 24 eggs to make 300 cookies for the bake sale.

Thus, option (b) is correct.

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Answer:

No they do not because it does not qualify for a triangle due to the extreme differences in messurments

Step-by-step explanation:

The range of data set 1 is 4

The range of data set 2 is 4.

A line plot is a graph that is made up of a number line and check marks above the number line. The check mark above the number represents the frequency of the number in the data set. For example, if the number 3 on the number line has 2 checkmarks above it, it means 3 has a frequency of 2.

The range is the difference between the highest number in a dataset and the smallest number in the dataset. Range is a measure of variation.

Range = highest number - lowest number

The range of data set 1 = 7 - 3 =  4

The range of data set 2 : 7 - 3 =  4

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The value of the function f(2) for the function with the equation  f(x) = 8 - 3x is 2

The function value is given as

f(x) = 8 - 3x

The above is a linear function

As a general rule

Linear functions are function that have constant average rates of change.

Note that the constant average rates of change can also be regarded as the slope or the gradient

From the question, we have the value to be

f(2)

The above means that we determine the value of the function when x = 2

i.e., f(x) = ? when x = 2 or we substitute 2 for x in f(x)

Next, we test the above function with the x value

So, we have

f(x) = 8 - 3x

Substitute 2 for x in f(x)

f(2) = 8 - 3 x 2

Evaluate the product in the above equation

So, we have

f(2) = 8 - 6

Evaluate the difference in the above equation

So, we have

f(2) = 2

Hence, the value of the function f(2) for the function with the equation  f(x) = 8 - 3x is 2

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Possible question

Given f(x)=8−3x, find the following: f(2)

The actual volume of the cylinder is 61.73 cm³

Percentage error is the error introduced in a measurement. The formula for the error is given as :

           Error = Percentage error * measured volume

According to the question we have been given that

                        determined volume of cylinder =  58.8 cm³

                         Percentage error  = 4.98%

thus, error = 4.98% * 58.8

                 = 0.0498 * 58.8

                 = ±2.93 cm³

The formula for the actual volume is given as

 Actual volume = measured volume ± error

                          = 58.8 ± 2.93 cm³

As the error is high we will do addition we get

                         = 58.8 + 2.93 cm³

                         = 61.73 cm³

hence the actual volume is 61.73 cm³

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Answer: 9.6 meters

Step-by-step explanation:

See attached image

The value of cos 67.4° is 5/13.

According to trigonometric identities used in mathematics, sin of an angle is equal to cos of 90 - the given angle. Mathematically, this means that, suppose we have an angle x, then-

sin(90 - x) = cos x

Here, we are given that sin 22.6° = 5/13. As we can observe that (90 - 67.4) is equal to 22.6, and we need to find the value of cos  67.4° only. Thus we can write the given equation as follows-

sin22.6° = sin(90 - 67.4°)

= cos 67.4°

Thus, sin 22.6° = cos 67.4°

Hence, cos 67.4° = 5/13

Thus, the value of cos 67.4° comes out to be 5/13.

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The percentage of students who spend less than 4 hours a week on screens which reported a grade average below 80 is 50%

Given, we have the report representing children spending time online, on social media or watching T.V, which has there effect on there grades as above or below 80.

By the question we know that the number of students who spends less than 4 hours a week on screen is:

9 + 9

= 18

And among the 18 students there are 9 students whose grade average is below 80.

So the percentage of the students who spends 4 hours a week on screen is:

= 9 ÷ 18 × 100%

= 100/2

= 50%

hence 50% students spend less than 4 hours a week on screens.

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The list that shows all the possibilities for the number of toy soldiers Jamal could place in each line is 1, 2, 17 and 34.

From the information, Jamal has 34 toy soldiers. He wants to arrange the soldiers into one or more equal-sized lines.

It should be noted that the factors of 34 are 1, 2, 17, and 34.

Therefore, the list that shows all the possibilities for the number of toy soldiers Jamal could place in each line is 1, 2, 17 and 34.

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Given the value of the circumference, the radius of the circle to the nearest tenth is 7.0m.

A circle is simply a closed 2-dimensional curved shape with no corners or edges.

The circumference of a circle is expressed mathematically as;

C = 2πr

Where r is radius and π is constant pi ( π = 3.14 ).

Given the data in the question;

Plug the given values into the circumference formula above and solve for r.

C = 2πr

44m = 2 × 3.14 × r

44m = 6.28 × r

Reorder the equation and divide both sides by 6.28

6.28 × r = 44m

( 6.28 × r )/6.28 = 44m/6.28

r = 44m/6.28

r = 7.0m

Given the value of the circumference, the radius of the circle to the nearest tenth is 7.0m.

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Car A travel before meeting car B in the middle is 268 second.

Constant Speed Motion

An object is said to travel at constant speed if the ratio of the distance traveled by the time taken is constant.

Expressed in a simple equation, we have:

v= d/t

Where  

v = Speed of the object

d = Distance traveled

t  = Time taken to travel d.

From the equation above, we can solve for d:

d = v . t

And we can also solve it for t:

t = d/v

Two cars are initially separated by 5 km are approaching each other at relative speeds of 55 km/h and 12 km/h respectively. The total speed at which they are approaching is 55+12 = 67 km/h.

The time it will take for them to meet is:

t = 5/67

t = 0.0746 hours

Converting to seconds: 0.0746*3600 = 268.56

Therefore the closest answer is d. 268 s.

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Answer:

9.3333333

Step-by-step explanation:

14÷1.50=9.333333

Answer:

n = 41/10 OR 4.1

Step-by-step explanation:

10n + 2 =43

10 + 2 - 2 = 43 - 2

10n = 43 - 2

10n = 41

10n/10 = 41/10

n = 41/10

Answer:

Step-by-step explanation:

10n + 2 = 43 what is the value of n

10n + 2 = 43

10n = 43 - 2

10n = 41

n = 41/10

-------------------

check

10 * 41/10 + 2 = 43

41 + 2 = 43

43 = 43

the answer is good

700 is a reasonable estimate for the pieces of paper the business office uses in 7 days

The office uses 307 pieces of paper every 3 days

The first is to calculate the number of paper used per day

= 307/3

= 102.3

The number of paper used in 7 days can be calculated as follows

= 7 × 102.3

= 716

Hence 700 is a reasonable estimate for the pieces of paper the business office uses in 7 days

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Answer:

okay so she got and odd sum 5 times which will mean she has -10 points and then she got a pair of threes which gives her 3 points so now she has -7 which means she needs 7 more points so the least amount would be 3

Step-by-step explanation:

Yes, area of the triangle also get doubled when the height of the triangle is doubled.

As given in the question,

Let 'b' be the base of the triangle

'h' be the height of the triangle

Area of the triangle = (1/2) × b × h

Base of the new triangle = b

Height of the new triangle doubled =2h

Area of new triangle = (1/ 2) × b × 2h

                                   = 2 {(1/2) × b × h}

                                   = 2 Area of original triangle

Therefore, area of the triangle also get doubled when the height of the triangle is doubled.

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Answer:

[tex]f\left(x\right)=\begin{cases}2x\:+\:10&-6\:\le x\: < \:-3\\ -x\:+\:1&-3\: < \:x\: < \:2\end{cases}[/tex]

Step-by-step explanation:

Looking at the graph we can see that it is a linear graph of the form

y = mx + b where m is the slope and b is the y intercept.

In one region the slope is positive and the other region it is negative

Interval 1 is -6 ≤ x < -3
How do I know that one uses a ≤ and the other uses a <?
A filled circle means that the point is included in the domain(range of x values) and therefore (≤, ≥) and an unfilled circle means it is not(<, >)

Find the slope of line in this interval
Take two points, say (-5, 0) and (-3, 4)

Slope = rise/run = (4 - 0)/(-3 - (-5) = 4/2 = 2

So slope of line is 2 and its equation in slope-intercept form is

y = 2x + b

Choose any point, plug in values, solve for b

Point (5, 0) is chosen
0 = 2(-5) + b

0 = -1 + b

or

b = 10

So equation of line in the interval (-6 ≤ x < -3) is
y = f(x) = 2x + 10

Interval 2: -3 < x < 2

We see this line intersects the y axis at y = 1

So b = 1

Equation is y = mx + 1

Choose point x = 0, y = 1 to find slope m

At x  = 0, y = m(1) + 1 = m + 1

So m + 1 = 0

m = -1

So equation of this line is

y = f(x) = -1x + 1 in the interval -3 < x < 2

Putting all these together we get the piecewise function as:
[tex]f\left(x\right)=\begin{cases}2x\:+\:10&-6\:\le x\: < \:-3\\ -x\:+\:1&-3\: < \:x\: < \:2\end{cases}[/tex]

Answer:

s = 13m + 384

hope this helped <3