Iam having a hard time simplifying (x^2 - 4x + 8)(2x - 1), can you me out?

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer