Explanation:
a)
A= 1/2 h(b1 + b2)
2A= h(b1+b2)
h= 2A/(b1+b2)
b)
I=P(1+rt)
I/P = 1+rt
I/P -1 = rt
t = (I/P -1) / r
c)
y = 5/x + a
y- a = 5/x
x(y-a) = (5/ x) × x
x = 5/ y- a
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