Question

Isaiah tracked the height of his Great Dane puppy from age 8 weeks to 52 weeks. He graphed the data and determined the line of best fit is y = 0.25x + 18 where x is the age in weeks, and y is the height in inches. How old was the puppy when he was 23 inches tall? Round to the nearest whole.

A,12 weeks

B.32 weeks

C.20 weeks

D.48 weeks

Answer 1

C ; 20 weeks

Explanation:

`y=0.25x+18\\23=0.25x+18\\23-18=0.25x+18-18\\5=0.25x\\(5)/(0.25)=(0.25x)/(0.25) \\20=x`