Phillip has x marbles. His father gave him 2 times the number of marbles he has. Now he has 21. How many marbles did Phillip have before?

Each week, copies of a national magazine are delivered to three different stores that have ordered 25 copies, 75 copies, and 120 copies, respectively.

How many solutions does the system have? 5x - y = 2 5x-y = - 2

A delivery person uses a service elevator to bring boxes of books up to an office. The delivery person weighs 140 lb and each box of books weighs 40 lb. The maximum capacity of the elevator is 1130 lb.

Simplify (x2 16) (x2-16) ? A. x4 - 256 B. x256 C. x432 D. x4-32

In a lab there are eight technicians. three are male and five are female. if three are selected, find the probability that at least one is female

Rodgers flight took off at 9:27 am. the flight is scheduled to land at 1:05 pm

How to turn 58,927 into scientific notation

Benchmark numbers to the nearest 10 The number is 453

What do you add to 3 and 4/7 to make 6?

What are the next three terms of the pattern 4, - 2, - 8, - 14, ... ?