A zucchini plant in Darnell's garden was 10 centimeters when it was first planted. Since then, it has grown approximately 0.5 centimeter per day.
a) write a rule to describe the function
b) after how many days will the zucchini plant be 18.5 centimeters tall?

Question

A zucchini plant in Darnell's garden was 10 centimeters when it was first planted. Since then, it has grown approximately 0.5 centimeter per day. 
a) write a rule to describe the function
b) after how many days will the zucchini plant be 18.5 centimeters tall?

anonymous · Answer

y = 0.5x + 10, 10 being the start of the growth, 0.5 being the rate. 
Plug in 18.5 for y, and solve for x. 
18.5 = 0.5 + 10
8.5 = 0.5x
17 = x

anonymous · Answer

I tried that and the quiz thing said it was wrong -_-"

anonymous · Answer

How the heck is that wrong?

anonymous · Answer

I don't know. GradPoint is dumb.