A computer is programmed to accept a number, add 4 to it, and then multiply the sum by 5. If x represents the number first fed into the machine, and the result of the first run is then fed back into the computer, what will the result of the second run be?
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Answer:
25x + 120
Step-by-step explanation:
After 1st run = 5(x + 4)
After 2nd run = 5((5(x + 4)) + 4)
= 5(5x + 20 + 4)
= 25x + 120
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