Question

PLEASE HELP:


Izzy's heartbeat rate was measured on an EKG machine. After conversion, the function produced could be modeled by a sine function, and the wave produced a maximum of 8, minimum of −2, and period of π. Which of the following functions could represent Izzy's EKG read-out?

f(x) = 8 sin πx − 2

f(x) = 5 sin πx + 3

f(x) = 5 sin 2x + 3

f(x) = 2 sin 2x + π

Answer 1

maximum of the A function is 8*1-2 = 6, so it can't be.
maximum of the D function is 2*1 +pi ~ 5, so it can't be either.
Both b and c are viable.
By definition of periodic function, if f(x) has period T, f(kx) has period T/k,
it means that the period of function b would be 2, and function c would be pi, which is the answer.

Answer 2

B or C

Answer 3

C

Answer 4

yep c