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Nat2105 [25]
3 years ago
10

You bought 3 whiteboard markers and one eraser for each of the ten students in class. A eraser costs $2.75 and the total cost wa

s $177.50. Write and solve an equation that you could use to find the cost of each whiteboard marker
Mathematics
1 answer:
Butoxors [25]3 years ago
3 0

Let M represent the cost of a whiteboard marker.

10(3M + $2.75) = $177.50

3M + $2.75 = $17.75

3M = $15

M = $5

Hence, each whiteboard marker cost $5.

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5^{-4x+7}\div 125^x=5^{f(x)}\\\\\Rightarrow5^{-4x+7}\div 5^{3x}=5^{f(x)}\\\\\\\Rightarrow \dfrac{5^{-4x+7}}{5^{3x}}=5^{f(x)}\\\\\\\Rightarrow 5^{-4x+7-3x}=5^{f(x)}}\\\\\Rightarrow 5^{-7x+7}=5^{f(x)}\\\\\Rightarrow -7x+7=f(x).

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8 0
3 years ago
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