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Natali5045456 [20]
3 years ago
7

I need help with Practice C.

Mathematics
1 answer:
Igoryamba3 years ago
5 0
Well, it's a little tricky but I believe the answer is D.
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Megan went to the store and bought 4 notebooks and 9 pencils for a total of $8.25. Joanne went to the same store and bought 7 no
Rzqust [24]
Let notebooks be x and let pencils be y

4x+9y=8.25 (equation 1)
7x+14y=14.00 (equation 2)

Multiply equation 1 by 7
So that you get 28x+63y=57.75

Multiply equation 2 by 4
So that you get 28x+56y=56.00

28x+63y=57.75 -
28x+56y=56.00
-----------------------
7y=1.75

Divide both sides by 7
1.75/7 is 0.25

So, now we know that one pencil costs 0.25 cents

Sub this y value into equation one

4x+9(0.25)=8.25

4x+2.25=8.25

Move 2.25 to the other side as a negative number

4x= 6

Divide both sides by 4

6/4 is $1.50

So, one pencil is equal to 0.25 cents and one notebook is equal to $1.50
5 0
3 years ago
Given f(x) = 3x+7, what is the output? *
sergij07 [2.7K]

Answer:

the answer to this problem would be 8.

3 0
3 years ago
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A wheelchair access ramp has an angle of elevation of 41 degrees. If the ramp reaches to the top of a 26 inch high porch, how lo
Gemiola [76]

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4 years ago
Determine if m^2-8m+16. is a perfect square trinomial and factor.
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Factor m2−8m+16
m2−8m+16
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Hal is asked to write an exponential function to represent the value of a $10,000 investment decreasing at 2% annually. What mul
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Y (x)=10000 (0.98)^x
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3 years ago
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