How do i multiply and exponent with different bases but the same exponent

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

When turned about its axis of rotation, which shape could have created this three-dimensional object?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.