15x4y2 letter B is your answer
a. -5
b. ?
c. Square root of 31
d. 18
e. ?
f. ?
Sorry I couldn't get them all :(
We know that
the area of a rectangle=length*width
let
length=x-3
width=x+8
area=42 ft²
so
42=(x-3)*(x+8)----------> x²+8x-3x-24=42--------> x²+5x-66=0
using a graph tool-------> to resolve the second order equation
see the attached figure
the solution is
x=6
hence
length=x-3------> 6-3-----> 3 ft
width=x+8 ------> 6+8----> 14 ft
the answer is<span>
the dimensions of the rectangle are 3 ft x 14 ft</span>
1/2 in simplest form is 1/2. you cant go any lower than that.