Can someone tell me how to solve for x?

The answer is x = 0

To find this we must first find the length of IJ, Since IK is equal to 13 and JK is equal to 6, we can subtract to find the value of IJ.

IJ = IK - JK

IJ = 13 - 6

IJ = 7

Now, we know the value of HJ in terms of x, as we do the value of HI. So, we can add HI to IJ, which we just found and set equal to HJ

HJ = HI + IJ

2x + 15 = x + 8 + 7 > Simplify

2x + 15 = x + 15 > Subtract 15

2x = x > Subtract x

x = 0

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.