Question

Foxoyo nine days ago, the area covered by the mold on a piece of bread was 3 square inches. Today the mold covers 9 square inches. What is the rate of change in molds area

Answer 1

Answer:

2/3 in²

Step-by-step explanation:

9 days ago,  mold = 3 in²

Now ,  mold = 9 in²

Therefore

9 days = 9 - 3 = 6 in²

Find the growth in 1 day:

9 days = 6 in²

1 day = 6 ÷ 9 = 2/3 in²

Answer: The growth rate is 2/3 in²  per day.

Answer 2

Answer:

$\frac{2}{3}$ in²/day

Step-by-step explanation:

9 days ago area covered = 3 in²

Today area covered = 9 in²

Change in area = 9 in² -3 in²

                          =6 in²

Total days = 9 days

Rate of change of area= $\frac{change in area}{total time}$

                                       = $\frac{6}{9}$

reducing it to lower fraction

                                        =$\frac{2}{3}$ in²/day