Which of the values below will make 3+x=21 true

Measures of the angle of r, 31 s (x+4) t (3x+9)

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

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.