Isincerly am bad at math xd. i need with this

Find the volume of the solid generated when the region bounded by y= x and y= 4√x is revolved about the x-axis the volume of the solid is: (type an exact answer cubic units)

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers