Question

Please solve it fast

Answer 1

Answer:

a)48

b)7

c)A becomes 4A

Step-by-step explanation:

Since they are proportional,

r^2 × K = A, where K is a constant.

r=5, A = 75

25K = 75

K = 3

• a) r=4

4^2 × 3 =16 × 3

A=48

• b) A=147

r^2 ×3 =147

r^2 =147/3 = 49

r=7

• c) R =2r

(2r)^2 ×k =a

4×(r^2 ×3)=a------------> 4 times r^2 × k

That is , the value of a is quadrupled (increasd 4 times)