-90 = 100 = x. First time learning this pretty difficult help

What is the answer to |-2x-5|-|-4+8| and x=7

For g(x) = 5x - 3 and h(x) = [tex]\sqrt{x}[/tex], find (g · h)(4)

Me! i will mark brainliest! i don't get polynomials and all that other stuff. so this question is really hard. multiply and simplify.(x - 4) (x^2 – 5x – 6)show your