after a 7% increase in salary, laurie makes $1647.80 per month how much did she earn per month before the increase
1 answer:
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Answer:
84
Step-by-step explanation:
f(1)=4^1 - 1 = 3
f(4) = 4^4 - 1 = 255
rate of change =
(255 - 3) / (4 - 1) = 252 / 3 = 84
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