What is the simplest form of this binomial expression?

a4 - b4

What adds to get 25 and 39

2/sqrt (10) simplified

If X + 3y = 7 and y=2, then X = ?

The owner of the west end kwick fill gas station wishes to determine the proportion of customers who pay at the pump using a credit card or debit card. he surveys 100 customers and finds that 80 paid at the pump.

Paulo has a job printing some certificates on A5, 148 x 210 mm size paper. He then has to post the certificates to the client. Paulo does not want to fold the certificates when he posts them.

In Mrs. Smith's enrichment class, 25% of the students are boys. There are 7 boys in the class. How many total students are in Mrs. Smith's enrichment class?

If a octagon is 25 centimeters long then the perimeter of the octagon is how many meters

In parallelogram ARMY, angle A equals (3x+10) ° and angle Y equals (2x+15.5) ° what is X?

A box contains 2 white, 3 red, and 4 black marbles. you choose two marbles and each are chosen at random. find the probability that both marbles are black

More precise 2.8 mm or 3.79 mm