Pls help me with this

Answer:

x = -0.6

y = 2.2

z = 2

Step-by-step explanation:

2x + y - 2z = -3

x + 3y - z = 4

3x + 4y - z = 5

Rewrite the system in matrix form and solve it by Gaussian Elimination (Gauss-Jordan elimination)

2 1 -2 -3

1 3 -1 4

3 4 -1 5

R1 / 2 → R1 (divide the 1 row by 2)

1 0.5 -1 -1.5

1 3 -1 4

3 4 -1 5

R2 - 1 R1 → R2 (multiply 1 row by 1 and subtract it from 2 row); R3 - 3 R1 → R3 (multiply 1 row by 3 and subtract it from 3 row)

1 0.5 -1 -1.5

0 2.5 0 5.5

0 2.5 2 9.5

R2 / 2.5 → R2 (divide the 2 row by 2.5)

1 0.5 -1 -1.5

0 1 0 2.2

0 2.5 2 9.5

R1 - 0.5 R2 → R1 (multiply 2 row by 0.5 and subtract it from 1 row); R3 - 2.5 R2 → R3 (multiply 2 row by 2.5 and subtract it from 3 row)

1 0 -1 -2.6

0 1 0 2.2

0 0 2 4

R3 / 2 → R3 (divide the 3 row by 2)

1 0 -1 -2.6

0 1 0 2.2

0 0 1 2

R1 + 1 R3 → R1 (multiply 3 row by 1 and add it to 1 row)

1 0 0 -0.6

0 1 0 2.2

0 0 1 2

x = -0.6

y = 2.2

z = 2

Answer:

C

Step-by-step explanation:

a function means each x value will have only one outcome

example, (8,5) (9,5) is ok but (8,6) (8,10) isnt

Answer: The correct answer is "C" because (x, y) represent a function of ordered pairs like {(-1, 1), (0, 0), (1, 1), (2, 2)}.     :)

Step-by-step explanation:

Answer: [tex]\overline{IJ}\cong \overline{MN}[/tex]

Step-by-step explanation:

Given: In triangle HIJ and triangle MNO we have

[tex]\overline{HI}\cong \overline{NO}, \angle{I}\cong \angle{N} ,\angle{H}\cong \angle{O}[/tex]

here, HI and NN are the included side between  ∠I & ∠H and ∠N and ∠O.

So , by ASA congruence rule,

ΔHIJ ≅ ΔMNO

So by CPCTC  (corresponding parts of the congruent triangles are congruent)

[tex]\overline{IJ}\cong \overline{MN}[/tex]

Answer: Nothing

Step-by-step explanation: There aren't any numbers that multiply to equal 6 but add to be -1.

There aren't any numbers that multiply to equal 6 but add to be -1 but we can say -6 and positive 1.

An equation is an expression that shows the relationship between two or more numbers and variables.A mathematical equation is a statement with two equal sides and an equal sign in between. example, 4 + 6 = 10. Both 4 + 6 and 10 can be seen on the left and right sides of the equal sign, respectively.

For that , we need to try solving it first using the method of substitution in which we express one variable in other variable's form and then it can substitute this value in other equation to get linear equation in one variable.

We need to find the number that equals 6 but adds to -1.

We can see that there aren't any numbers that multiply to equal 6 but add to be -1.

So, we conclude that number could be -6 and positive 1.

Learn more about equations here;

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Answer:

The number of cups of seeds that Sarah put in each bird feeder each day is:

= 4/7 or 0.57 cups.

Step-by-step explanation:

a) Data and Calculations:

Number of cups of seeds = 12 cups

Number of bird feeders = 3

Therefore, each bird feeder will get 12/3 = 4 cups per week

In a week, there are 7 days.

This implies that each bird feeder will get 4/7 cups

This is equivalent to 0.57 cups for each bird feeder per day.

b) Sarah will be putting 4/7 cups of seeds in each bird feeder.  When 4/7 is multiplied by 3 *7, we get a total of 12 cups, which represent the total number of cups of seed given initially to Sarah.

Answer:

The number of cups of seeds that Sarah put in each bird feeder each day is: = 4/7 or 0.57 cups.

Step-by-step explanation:

Answer:

yes.

Step-by-step explanation:

2.4 + 6.5 = 8.9 (triangle inequality)

8.9 > 7.4

= it is possible to make a triangle wit these measurements.

Answer: It increased by 78.89%

Step-by-step explanation:

2.810 / 3.562

=0.7889

78.89%

The approximate percent of change is 26.76% increase.

A percentage is a value per hundredth. Percentages can be converted into decimals and fractions by dividing the percentage value by a hundred.

Given, The average price for gasoline per gallon is $3.562.

last year the average price for gasoline per gallon was $2.810.

∴ The net amount change is  $(3.562 - 2.810) = $0.752.

Now to obtain percentage change we'll divide the net amount change by the original amount and multiply it by 100% which is,

= (0.752/2.810)×100%.

= 26.76% increase.

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Answer:

26.25

Step-by-step explanation:

I'm not sure if I'm right but I did 37.5 - 15 and I got 22.5. 22.5 divided by 2 gives me 11.25, so I added 15 and 11.25 which gives me 26.25

Answer:

x = - 6 y = 13

Step-by-step explanation:

we know when the diagonals bisect it divides into two equal parts so

-4x - 2 = -3x + 4

-4x + 3x = 4 + 2

- x = 6

x = - 6

Now

2y + 8 = 3y - 5

3y - 2y = 8 + 5

y = 13

Hope it will help :)❤

Answer:

x < 11

Step-by-step explanation:

8 - 3x > -25

Subtract 8 from each side

8 - 3x-8 > -25-8

-3x> -33

Divide each side by -3, remembering to flip the inequality

-3x/-3 < -33/-3

x < 11

Answer:

i think 6 x 72 = calculator

Step-by-step explanation:

Answer:

6 x 70 = calculator

Step-by-step explanation:

Answer:

4

Step-by-step explanation:

yes.

Answer:

Because besides for the principal amount, it has a steady growth. In simple interest, it is a linear equation.

Step-by-step explanation:

Answer:

C. 70

Every triangle's interior angles add up to 180°, and a flat line is eqal to 180°.

180°-115°=65°

180°-135°=45°

65+45=110

180-110=70

Answer:

70

Step-by-step explanation:

trus me .have no if we day

Answer:

its closer to 1....

Step-by-step explanation:

1/2 is half

so...

half of 15 is 7.5

8 is larger than 7.5

so that makes it closer to one

Answer:

65

Step-by-step explanation:

8^2 - (6+3) + 10

PEMDAS says parentheses first

8^2 - (9) + 10

Then exponents

64 - (9) + 10

Then add and subtract from left to right

55 +10

65

Answer:65

Step-by-step explanation:

8^2 -(6+3) +10

8^2-9+ 10 . Do parenthesis

64-9+10. Do the exponent

55+10. Subtract

65. Add

brainliest requested.

Answer:

Let's solve your equation step-by-step.

−5(3−x)+4=5x−11

Step 1: Simplify both sides of the equation.

−5(3−x)+4=5x−11

(−5)(3)+(−5)(−x)+4=5x+−11(Distribute)

−15+5x+4=5x+−11

(5x)+(−15+4)=5x−11(Combine Like Terms)

5x+−11=5x−11

5x−11=5x−11

Step 2: Subtract 5x from both sides.

5x−11−5x=5x−11−5x

−11=−11

Step 3: Add 11 to both sides.

−11+11=−11+11

0=0

Answer:

A

Step-by-step explanation:

8/13 = 8 divided by 13

because it is  thedivided by the denominator

[tex]\left \{ {{y= numerator} \atop {x=denominator}} \right.[/tex]

Answer:

Step-by-step explanation:

I HOPE IT HELPS :)

Answer:

I'm not sure but I think it is letter A

Step-by-step explanation:

Because first off 0 is divisible by any integer number meaning it has to be divide by a whole number not fraction. Also, 0 + 2 = 2 then you divide that by 4 is 0.5.

Answer:

Not sure

Step-by-step explanation:

Answer:

The answer is D because it wants the total distance covered on the three days, not how many he walked per day (which would be B)

Step-by-step explanation:

I hope this helped :)

Answer:

C.

Step-by-step explanation:

Answer:

A

Step-by-step explanation:

You would just have to find the opposite of cube root which is cubed so that means a is correct

Answer:

25 is 2.5 standard deviations from the mean.

Step-by-step explanation:

Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean.

In this question:

Mean of 15 and a standard deviation of 4, so [tex]\mu = 15, \sigma = 4[/tex]

How many standard deviations from the mean is 25?

We have to find Z when [tex]X = 25[/tex]. So

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{25 - 15}{4}[/tex]

[tex]Z = 2.5[/tex]

So 25 is 2.5 standard deviations from the mean.

Answer:

2.5

Step-by-step explanation:

i just took the test

Answer: 8

Step-by-step explanation:

From the question, we are informed that Hilary has 48 building blocks in the red bucket which is 6 times as many blocks in the green bucket.

Let the number of building blocks that are in the green bucket be represented by x.

Based on the scenario given in the question, this will be:

6 × x = 48.

6x = 48

x = 48/6.

x = 8

This means that there are 8 green building blocks

the answer is c

let's check

-4(1)+3=-1

-4(2)+3=-5

.......

Answer:

3x-5y=20

-3x=

5y=3x-20

/5=

y=(3x/5) - (20/5)

y=3/5-4