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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)
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