Which of the following equations of ratios make a true proportion?

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29