I need help with 3 and 4 i think i finished 4 but want it to

I need help with #3 and #4, i think i finished #4 but want it to be double checked

3) In addition to dearing the land for the separate treatment area. you will need to completely fence the perimeter The company that produces the fencing material you will use charges of $1000 plus a per- section a fixed rate rate of $27.00 for the fencing that you need to install. You are charging the city of per section of Falls s3a.oo fencing that you install around the treatment area. In solving this problem, let x represent the sections of fence you will purchase. What is the breakeven point for building the fence? 4) Those that have been given the new drug need to be separated from everyone else for a period of two weeks. The space needs to be 150 square feet. The length of the building has ta be 20 feet longer than the width. Use a quadratic formula to solve for x

Solution

x = sections of fece that wis purchased

Cost of fecning material : C(x) = 1000 + 27x

Cost of installing fence : R(x) = 38x

Breakeven : C(x) = R(x) and solve for x:

1000 + 27x = 38x

11x = 1000 ; x = 90.9 = 91 sections

4) Area = 150 sq ft

length = 20 + width

Let width be x

So, length = 20+x

Ares = x(20 +x) = 150

x^2 + 20 x -150 =0   Solve quadratic

x= 5.81 , -25.81 .Neglect -ve root

So, width x = 5.81 ; length = 25.81