Please help me with this i will give brainliest

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

To decrease an amount by 16% what single multiplier would you use

Atown has a population of 12000 and grows at 3.5% every year. what will be the population after 7 years, to the nearest whole number?