Answer:
A.
Step-by-step explanation:
j=39 so 39x5=195
x + 110 + 47 = 180
x = 180 - 157
x = 23
It should be 87% cz 87/100
The period of y = 4 cos(8πx) is 2π/(8π) = 1/4, since
cos(x - 2π) = cos(x)
and if we replace x with 8πx, we get
cos(8πx - 2π) = cos(8πx)
and
8πx - 2π = 8π (x - 1/4)