Explanation:
ex1 :
a) the are of the circle is r x r x 3.14 = 15 x 15 x 3.14 = 706
b) the price is 1.25$ x 706 = 882.5$
.
ex2:
a) g(1) = 5, f(5) = 20, so 20
b)f(2) = -1, g(-1) = 1, so 1
c) g(0) = 3, g(3) = 9, so 9
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