Determine the cross product of the vectors x x y x= 13i + 4j - 9k y= -i + 7j - 4k

Me because some of question i don’t understand

What is sin 7x/4 ? i need on this urgent trig

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?