
Using the identity:

, we get:

There are two solutions to this equation:
1) 
Since the period of cosine is 2π, so 0 + 2π = 2π will also be a solution to the given equation
2)
Therefore, there are 3 solutions to the given trigonometric equation.
8x5=40
So the car is 40 inches long
4·9 = 9x = 1/4
(36 = 9x = 1/4) ·4
144 = 36x
144/36 = x
x = 4
Answer:
85% off $51 is $43.35 which equals to $7.65
Amanda paid only $7.65 for the 85% off the original price.
Step-by-step explanation: