book Maths Puzzle Numerical Ability

(c-2b)2squared + d
when a=1,b=-2, c=3, and d=-4

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book Other Question

A sky diver in free fall travels at a speed modeled by

V(t) = 176(1 - e - 0.18 t)

ft per second after t seconds. How long will it take for the skydiver to attain the speed of 60 mph (note: 60 mph = 88 ft/sec)? do the formulas for the area of a circle and the circumfrence of a circle represent linear relationships?