Answer:
8r^4 - 16r^2
2Step-by-step explanation:
8r^2(r^2-2)
Multiply everything inside the brackets by the term outside of it.
8r^4 - 16r^2
The correct answer would look something like this:
For this case we must find the value of "x", by trigonometric relations.
The tangent of an angle is given by the leg opposite the angle on the leg adjacent to the same angle.

Rounding:

Answer:
21.4
Answer: $54.00
Step-by-step explanation:
$45.00 x .20 = $9.00
$45.00 + $9.00 = $54.00