What kid of math is this?
Answer:

Step-by-step explanation:
We are given: 
So, the integral will be used to calculate the volume.

Answer:
they need to sell 15,000 because 42 percent of 15,00 is 6,300+2500=800
the inequality should be. 2500+0.42s≥8,800
and the number line should have a closed point on 15,000 with the line pointing to the right