Which expression is the best estimate of the product of StartFraction 7 over 8 EndFraction and 8 and StartFraction 1 over 10 EndFraction?

Find the value of ax 4 ; a = 2, x = 1. select one: a. 2 b. 4 c. 1 d. 8

This is about circle theorems. someone asap : (

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.