What is the sum of 3x + x +7x - 4y?

What is the value of r of the geometric series?

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

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.