Can someone help me please im struggling and can’t figure these 2 problems out :(

What is the length of the unknown leg in the right triangle ?

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis. y = 7ex, y = 7e^-x, x = 1; about the y-axis

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the