6
divide 80 by 4 to get 20
20 - 14 = 6
6 is the answer
Set up as a proportion
90/6 = 300/x
multiply 90x=6(300)
90x = 1800
divide both sides by 90
x=20
Answer:
.111 11.1%
2/5 2:5
12.5% 1:8
Step-by-step explanation:
Take into account, that in general, a cosine function of amplitude A, period T and vertical translation b, can be written as follow:

In the given case, you have:
A = 4
T = 3π/4
b = -3
By replacing you obtain:

Hence, the answer is:
f(x) = 4cos(8/3 x) - 3