The line’s a and b intersect at point D. What is the value of z?

Z = ?

How do you use the elimination method for this question? explain, because i really want to understand!

Asphere has a diameter of 10 in. what is the volume of the sphere?

Bill works as a waiter and is keeping track of the tips he ears daily. about how much does bill have to earn in tips on sunday if he wants to average $22 a day? tips by day tips (dollars) monday tuesday wednesday thursday friday saturday $14 $22 $28 $36