2.5/10^-5 and 3/10^6 in standard form

Bed a is seven feet long. bed b is 7/8 of bed a. bed c is 7/8 of bed b. bed d is 7/8 of c. a. come up with an expression for the length of bed d. b. what is the length of bed d?

What is the value of x in the equation (2)3) (x+6)= -18 a. -36 b. -33 c. -24 d. -18

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !