For this case we have to:
x: It is the variable that represents the number of compact discs.
The cost function must be found considering that each disk costs $7.13. So:

Thus, to find the total cost of "x" compact discs (in $) we substitute the number of discs in the cost function.
Answer:

Let f(b) = <span>3b^2+13b+4/b+4
</span>the domain of f is D = {b/ b+4#0} so b# - 4
so the undefined value of is when b = -4
X=40 the right angle is 90 degrees and 90-10 = 80, 80 = 2x, so x = 40
Answer:
x > 2
Step-by-step explanation:
Given
4x +
(2x + 4) > 12 ← distribute and simplify left side
4x + x + 2 > 12
5x + 2 > 12 ( subtract 2 from both sides )
5x > 10 ( divide both sides by 5 )
x > 2
Answer:
A,B,C,E
Step-by-step explanation: