Answer:
The area of the rectangle is increasing at 78cm/sec
Step-by-step explanation:
<u>Explanation</u>:-
Given the length of a rectangle is increasing at a rate of 3 cm/s
Given the width of a rectangle is increasing at a rate of 9 cm/s
we know that the area of the rectangle
A = l × w …(l)
Differentiating equation with respective to 't'
Given the length of the rectangle = 7 cm and
The width of the rectangle w = 5 cm
<u>Final answer</u>:-
The area of the rectangle is increasing at 78cm/sec