If you know the value of sin(30°), which of the following can you calculate directly through using the half angle formula? cos(30°)
sin(45°)
sin(15°)
sin(60°)

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?