Answers
10x + 20y = 690
Now get x by itself on one side by subtracting y
10x = 690 - 20y
Divide by 10 on both sides
X = 69 - 2y
Now plug this value for x into a separate equation just showing the amount of coins
(X+y=45)
69 - 2y + y = 45
Now solve for y
69 - y = 45
-y = -24
Y = 24
Now plug this y value into the same equation to solve for x
X + 24 = 45
X = 21
To check this work add both values into the original equation and solve
10(21) + 20(24) = 690
210 + 480 = 690
690 = 690
Answer:
$10 coins: 21
$20 coins: 24
Step-by-step explanation:
So we can create 2 equations where
x = number of $10 coins
y = number of $20 coins:
x + y = 45
10x + 20y = 690
we can move equation 1 around so that we can get a value of x
x = 45 - y
now we can substitute x into the second equation
10(45 - y) + 20y = 690
450 - 10y + 20y = 690
10y = 240
y = 24
Now plug in y back into the first equation
x = 45 - y
x = 45 - 24
x = 21
Related Questions
How many groups of 2/3 are in 1
Answers
Answer:
1 and 1/3
Step-by-step explanation:
please answer asap!!
Answers
Answer:
16
Step-by-step explanation:
Kabir earned $25.00 for a week's work. If he paid 16% of it in taxes how much did he
pay in taxes?.
Answers
Answer:
4
Step-by-step explanation:
the 16 percent of 25 is 4.
Answer:
4
Step-by-step explanation:
16 percent of 25 is 4
so he paid 4 dollars tax
hope this helps...
Rewrite in simplest terms:
10 ( 7 g − 9 h ) − 4 h − 8 ( − h + 8 g )
Answers
Answer:
[tex]6g -86h[/tex]
Step-by-step explanation:
[tex]10( 7g-9h) -4h - 8(-h + 8g)[/tex]
1) First, distribute the 10 and the -8 to the terms in the parentheses next to them. Remember, don't distribute to the -4h since it is not in the parentheses.
[tex]10( 7g - 9h) -4h - 8(-h + 8g)\\70g - 90h-4h+8h-64g\\[/tex]
2) Next, combine like terms. (Any terms that have the same variables must be added together by their coefficients.)
[tex]70g - 90h-4h+8h-64g\\\\70g-64g-90h-4h+8h\\6g-86h[/tex]
There are no more like terms to combine, so [tex]6g -86h[/tex] is the answer.
please answer asap!!!
Answers
Answer:
8
Step-by-step explanation:
Line RT will be 2x smaller than QU because line RT splits lines QS and US equally.
Answer:
8
Step-by-step explanation:
Because RT is smaller than QU so thereforeyou would have to divide 16 by 2 to get 8
The accompanying data on x= head circumference z score (a comparison score with peers of the same age - a positive score suggests a larger size than for peers) at age of 6 to 14 months and y =volume of cerebral grey matter (in ml) at age 2 to 5 years were read from a graph in an article.
A) what is the value of the correlation coefficient? (Give the answer to two decimal places.) r=
B)Find the equation of the least- squares lines. (Give the answer to two decimal places.)
C) Predict the volume of cerebral grey matter for a child whose head circumference z score at age 12 months was 1.9. (Give the answer to two decimal places.)
Answers
Answer:
[tex]r=0.77[/tex], [tex]\hat{y}=770.50+39.37x[/tex] and volume of cerebral brey matter for a child whose head circumference Z score at age 12 months was 1.9 is [tex]\hat {y}=920.10[/tex]
Step-by-step explanation:
We attached a table below,
[tex](a)[/tex] We attached a table below,
Therefore ,
correlation coefficient [tex]r=\frac{\frac{1}{18}(21766.7)-(\frac{27.25}{18} )(\frac{13890}{18} ) }{\sqrt{\frac{1}{18} (59.8435)-(\frac{27.25}{18} )^2}\sqrt{\frac{1}{18}(10767400)-(\frac{13890}{18} )^2 } }[/tex]
[tex]=\frac{41.04}{53.19}[/tex]
[tex]=0.77[/tex]
[tex](b)[/tex] We calculate the least squares equation.
[tex]b_1=r(\frac{\sigma_y}{\sigma_x} )\\ =(0.77)(\frac{\sqrt{\frac{1}{18} (10767400)-(\frac{13890}{18} )^2} }{\sqrt{\frac{1}{18}(59.8435)-(\frac{27.25}{18} )^2 } } )\\ =0.77(\frac{52.15}{1.02} )\\ =0.77(51.13)\\ =39.37[/tex]
Now , calculate intercept coefficient.
[tex]b_0=\bar{y}-r\bar{x}\\[/tex]
[tex]=(\frac{\sum{y}}{n} )-0.77(\frac{\sum{x}}{n} )\\=(\frac{13890}{18} )-0.77(\frac{27.25}{18} )\\=771.67-1.17\\=770.50[/tex]
Therefore, the regression equation is, [tex]\hat{y}=770.50+39.37x[/tex]
[tex](c)[/tex] Find the volume of cerebral brey matter for a child whose head circumference Z score at age 12 months was 1.8
[tex]\hat{y}=770.50+39.37x[/tex]
[tex]=770.50+39.37(1.9)\\=770.50+74.80\\=920.10[/tex]
Help!!! I need help ASAP!!!
Answers
Answer:
The answer would be C.
Step-by-step explanation:
The formula for the area of a square is A=(3.14)r^2
Answer:
its A
Step-by-step explanation:
a bakery sells 10 lemon poppy muffins for every 1 bran muffin sold.
Answers
Answer:
The answer is D.
Step-by-step explanation:
My explanation is in the picture as u can see.
Give two appropriate names for the line.
Points A, B, C, and D appear from left to right on a number line.
Answers
Answer:
AD and BC
Step-by-step explanation:
Lines are infinite
Thank, 5 star, and brainliest if helpful!
Please answer 5 questions its urgent!
1.Write the ratio as a fraction in simplest form.
15 girls to 6 boys
2.Write the ratio as a fraction in simplest form.
24 players : 3 teams
3.Write the ratio as a fraction in simplest form.
48 worksheets : 12 students
4.Tell whether the ratios form a proportion
(This is a fraction) 4/7 4 on top of the 7 24/35 24 on top of 35
5.Tell whether the ratios form a proportion
11/12 11 on top of the 12 33/36 33 on top of the 36.
Answers
Answer:
1. 5/2 2. 8 3. 4 4.no 5. yes
Step-by-step explanation:
find the perimeter of 15ft 13ft
Answers
56ft
Explanation-
15+15=30 13+13=26
30+26=56
Mwamini wants to drink water and juice within a certain time limit. She drinks juice at a constant rate, and she drinks water at a rate of 25 seconds per liter.
Let W represent the number of liters of water and J represent the number of liters of juice that Mwamini can drink within her time limit.
25W+40J<120
According to the inequality, at what rate does Mwamini drink juice, and what is her time limit?
Mwamini drinks juice at a rate of ___
seconds per liter, and her time limit is ____
seconds.
Can Mwamini drink 2 liters of water and 1 liter of juice within her time limit?
Choose 1 answer:
yes or no
Answers
Answer:Mwamini drinks juice at a rate of 40 seconds per liter, and her time limit is 120 seconds.
Answer:Yes
Step-by-step explanation:
1) Mwamini drinks juice at a rate of 40 seconds per liter, and her time limit is 120 seconds.
2) Mwamini can drink 2 liters of water and 1 liter of juice within her time limit.
What is inequality?"It is a mathematical statement of an order relationship (greater than, greater than or equal to, less than, or less than or equal to) between two algebraic expressions."
For given question,
We have been given an inequality 25W + 40J < 120
W represent the number of liters of water and J represent the number of liters of juice.
Mwamini drinks water at a rate of 25 seconds per liter.
Mwamini drinks juice at a rate of 40 seconds per liter, and her time limit is 120 seconds.
If Mwamini drinks 2 liters of water and 1 liter of juice.
Here, W = 2 lit and J = 1 lit
So, ⇒ 25W + 40J
= 25(2) + 40(1)
= 50 + 40
= 90
< 120
This means, Mwamini can drink 2 liters of water and 1 liter of juice within her time limit.
Learn more about inequality here:
https://brainly.com/question/20383699
#SPJ2
the midpoint of the line segment from p 1 p 2 is (- 6, 2) . if p 1 =(-8,2) , what is p 2 ?
Answers
((x1+x2)/2,(y1+y2)/2)
We have the first set of coordinates which is (-8,2) and we have the midpoint which is (-6,2)..
For the x-coordinate:
(-8+x2)/2=-6
-8+x2=-12
x2=-12+8
x2=-4
For the y-coordinate:
(2+y2)/2=2
2+y2=4
y2=2
So the coordinate p2 will be (-4,2)
say a radical cube root equation with an extraneous solution and a radical cube root equation without an extraneous solution
Answers
One equation that does have an extraneous solution is: [tex]x + 1[/tex] = [tex]\sqrt{7x+ 15}[/tex]
One equation that doesn't have an extraneous solution is: [tex]\sqrt{x}[/tex] = 4
Answer:
agreed withe one above
Step-by-step explanation:
What is the missing reason for line 3 in this proof? LZM
Answers
I have no idea what you mean!!!! Make it more clear next time. ;)
Answer: B. substitution property of =
Explanation:
The given points, LM, LZ, and MZ, were substituted for their numbers.
Bonus:
Line 5- C. division property of =
Line 8- D. multiplication of real numbers
Line 2- D. segment addition postulate
I hope this helped!
Good luck <3
Which fraction is equivalent to the decimal 0.15?With the line over.
A. 1/15
B. 1/6
C. 3/20
D. 5/33
Answers
Answer:
C.
Step-by-step explanation:
divide 100 and dive 15 by 5
Answer:
C 3/20
Step-by-step explanation:
step by step explain
What number must multiply each side of the equation 25x=10 to produce the equivalent equation x = 25?
15
52
4
5
Answers
Answer:
Multiply both sides by [tex]\frac{5}{2}[/tex]
Step-by-step explanation:
Given
[tex]\frac{2}{5}x = 10[/tex]
Required
Get an equivalent of [tex]x = 25[/tex]
To do this, we simply multiply through by [tex]\frac{5}{2}[/tex]
[tex]\frac{5}{2} * \frac{2}{5}x = 10 * \frac{5}{2}[/tex]
[tex]\frac{5*2}{2*5} x = 10 * \frac{5}{2}[/tex]
[tex]\frac{10}{10} x = 10 * \frac{5}{2}[/tex]
[tex]\frac{1}{1} x = 10 * \frac{5}{2}[/tex]
[tex]x = 10 * \frac{5}{2}[/tex]
[tex]x =\frac{10*5}{2}[/tex]
[tex]x =\frac{50}{2}[/tex]
[tex]x = 25[/tex]
Solve the system by substitution.
y = x - 6
y = -5x
Answers
Answer:
So.... you gave me the value of y in terms of x, twice...I am not sure what you want me to solve.
X-6 =-5x
-6=-6x
1=x
Then plug that value of x into either equation to find y.
Y = 1 -6
Y = -5
Solution is (1, -5)
Edgar is scuba diving 50 feet below the water. He is swimming to the surface at a rate of 3 feet per second. Write an equation to represent his depth, d, after s seconds.
Write an equation to represent his depth.
Answers
Answer:
i know the answer but not the equation
Step-by-step explanation:
Find the first four terms of the sequence given by the following.
4,=(-1)".31%, n=1, 2, 3, ...
Answers
Answer:
The first term of the sequence is:
a₁ = -3a₂ = 12a₃ = -27a₄ = 48Step-by-step explanation:
Given the sequence
aₙ = (-1)ⁿ · 3n²
substituting n = 1 to determine the first term
a₁ = (-1)¹ · 3(1)²
a₁ = (-1)¹ · 3(1)²
Applying the exponent rule: [tex]a^1=a[/tex]
a₁ = -1 · 3(1)
a₁ = -1 · 3
a₁ = -3
substituting n = 2 to determine the 2nd term
a₂ = (-1)² · 3(2)²
a₂ = 1 · 3(4)
a₂ = 12
substituting n = 3 to determine the 3rd term
a₃ = (-1)³ · 3(3)²
a₃ = -1 · 3(9)
a₃ = -1 · 27
a₃ = -27
substituting n = 4 to determine the 4th term
a₄ = (-1)⁴ · 3(4)²
a₄ = 1 · 3(16)
a₄ = 1 · 48
a₄ = 48
Therefore, the first term of the sequence is:
a₁ = -3a₂ = 12a₃ = -27a₄ = 48Which operation will "undo" subtraction?
Answers
Answer: addition ??
Step-by-step explanation:
Answer:
Addition
Step-by-step explanation:
An inverse operation are two operations that undo each other e.g. addition and subtraction or multiplication and division. You can perform the same inverse operation on each side of an equivalent equation without changing the equality.
Therefore, it is addition
Hope this helps :)
herrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrreeeeeeeeeeeeeeeee pt 3
Answers
Answer: 2808 ft.
Explanation: 78*36 is 2808
classify the real number as a r rational or irrational number?
PLEASE HELP
Answers
Answer:
the rational ones are the ones that are gonna give you an equal answer and the irrational the opposite.
Step-by-step explanation:
I need this by tomorrow! I will mark you Brainliest, 10,12, and 14
Answers
Answer:
-1.3n+1.5
-6.4n+9.8
-0.36n-4
Step-by-step explanation:
50 POINTS
Select the correct answer.
Consider function f.
f(x)= 2x^2
What is the value of (f o f)(x)?
A: 16x^4
B: 4x^2
C: 4x^4
D: 8x^4
Answers
Answer:the answer is D
Step-by-step explanation:
I just took the test,its 8x^4.
The value of the function (f o f)(x) will be 4x⁴. Then the correct option is C.
What is a function?A statement, principle, or policy that creates the link between two variables is known as a function.
The function is given below.
f(x)= 2x²
Then the value of the function (f o f)(x) will be
(f o f)(x) = f(x) · f(x)
(f o f)(x) = 2x² · 2x²
(f o f)(x) = 4x⁴
Then the correct option is C.
More about the function link is given below.
https://brainly.com/question/5245372
#SPJ2
13. Find the slope and a point on the line for the lines with the following equations
a. y - 9=-3/4(x - 4)
b. y = 3 - 2/3 (x +4)
Answers
Answer:
look for it in a math app
Step-by-step explanation:
What is the slope of the line on the graph?
Enter your answer in the box.
Answers
Answer:
6
Step-by-step explanation:
The find the slope of a line given any two points, we can use the slope formula given by:
[tex]\displaystyle m=\frac{y_2-y_1}{x_2-x_1}[/tex]
We can choose the two points (0, -1) and (1, 5) from the graph.
Let (0, -1) be (x₁, y₁) and let (1, 5) be (x₂, y₂). So:
[tex]\displaystyle m=\frac{(5)-(-1)}{(1)-0}=\frac{6}{1}=6[/tex]
Hence, the slope of the line is 6.
slope is the ratio of vertical increase to horizontal increase
-4(3x - 5) pls help ??
Answers
Answer:
-13x+20..............
Answer:
-12x+20
Step-by-step explanation:
write an equivalent expression to represent Bradens total earnings for this week.
8h + 129 + 3h = ?h + ?
Answers
Answer:
11h +129
Step-by-step explanation:
8h + 129 + 3h = ?h + ?
11h +129
Answer:11h +129
Step-by-step explanation:You add like terms together which are 8 h and 3h which gives you 11 h.And you have 129 left so you add 11 h to 129 .So you get 11 h +129 as your equivalent expression to represent Bradens total earnings for this week.
Hope it helps and ur are welcome :)
What is the relationship between the 6 in the number 6.45 and the 6 in the number 62
Answers
6 in the number 6.45 is the ones digit.
6 in the number 62 is the tens digit.