The ratio of the number of dolls Jacky had to the number of dolls Peter had was 5:2 but, after Jacky gave 15 dolls to Peter, the
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Answer:
<em>129 </em>
Step-by-step explanation:
Increasing rate of length, = 9 cm/s
Increasing rate of width, = 7 cm/s
Length, l = 12 cm
Width, w = 5 cm
To find:
Rate of increase of area of rectangle at above given points.
Solution:
Formula for area of a rectangle is given as:
OR
Differentiating w.r.to t:
Putting the values: