Can someone help me with this.​

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much