In the diagram below, de is parallel to xy.
what is the value of x?

you can't solve x because it is 2 linear equation and you only have one equation

a - base

b - exponent

so,

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.