Find the slope of the line that passes through each pair of points

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.

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

3.4a=57.8 what is the the value of a