Cos (a-b) = cos a cos b + sin a sin b for all values of a and b. True or False

Find k so that 25x^2 + 40x + k is the square of the binomial.

What is a remainder when forty five is divided by seven

Zoe has 7 books on her shelf, and she wants to read any 3 of them on vacation. How many sequences of 3 books are possible?

The lengths of the sides of four triangles are given. Which triangle is a right triangle? F: 2, 3, 4 G: 11, 15, 20 H: 10, 24, 26 J: 5, 5, 5

A full-time employee who works 40 hours week earns 19.50 per hour. Estimate that person's annual income

Two trains leave the station at the same time, one heading west and the other east. The westbound train travels 18 miles per hour faster than the eastbound train.

Enguun earns $17 dollars per hour tutoring student-athletes at Brooklyn University a. If Enguun tutored for 19.5 hours last month, how much money did she earn last month?

One side of a triangle is twice another. The third side is 8 inches and the perimeter of 26 inches. How long is each side?

A new sidewalk will be 6 feet wide, 100 feet long, and filled in a debt of 9 inches with concrete. How many cubic yards of concrete are needed?

Zahra compares two wireless data plans Which equation gives the correct value of n the number of GB for which Plans A and B cost the same (G8 means 'gigabytes of data) Wireless Plan A No initiate fee and 8$ for each GB Wireless Plan B $20 for the