Ahmad is on a Facebook group that has 7 members. How many different sub groups of 3 people could be formed that have Ahmad as a members?

In the Ostwald Process, 4 molecules of ammonia and 5 molecules of oxygen react to produce 4 molecules of nitric oxide and 6 molecules of water.  Which of the following equations correctly models...

If the polynomial P(x) has factors of 12, (x-5), and (x+4), which of the following must also be afactor of P(x)?   Edit:    I'm so sorry that...

A telephone company charges x cents for the first minute of a call and charges for any additional time at the rate of y cents per minute. If a certain call costs \$7.75 and lasts more than one minute...

Line x and Y is parallel. Line L pass through point (-1,-6) and vertex of parabola the equation is y=-2(x-1)+2. If (r,s) lies on line K, which of the following is another of K?

Hi,i would like to know about tricks in SAT mathmatics test.  I always can't figure out this questions -> that problem expressed in words or table chart question.   Thank...

In the United States, 55 million computers, 32 million televisions, and 150 million cellphones were either disposed of or recycled in the past year. If 30% of computers, 20% of televisions, and 10%...

hey I don't have idea how to calculate this problem. please give me an advice. kx-3y=4 4x-5y=7 x and y are variables,k is a constant . For what value of k will system of equations...

When Gisela starts running, Kim is walking and is 10 yards ahead of her. Moving in the same direction on the same straight path, Gisela runs 5 yards for every 1 yard that Kim walks. At these relative...