Answer:
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Step-by-step explanation:
D it's store d, it's the cheapest
The answer is 600 because you have to multiply 120 by 5 and the sum is 600
Ur output value is f(x).....so to do this problem u need to sub in 2/3 for f(x) and solve for the input value which is x
f(x) = -1/3x + 7
2/3 = -1/3x + 7 ...multiply everything by 3
2 = -x + 21
2 - 21 = - x
- 19 = -x
19 = x <== ur output
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