Plz plz plz HEL 20 divided by 34

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Find the missing variable for a parallelogram: a = latex: 28in^2 28 i n 2 h = b = 6.3 in (1in=2.54cm)

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document