The expression (7+8x)+2x is simplified in several steps below. For each step, choose the reason that best justifies it. No links please

Evaluate the expression for the given value of the variable 7a - 4a for a =8

This is so hard and it’s for a test

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.