Prove that sec (-pi/4) = sqrt2.

Why do you get a positive 2y when you subtract a - 2y from a positive 0y?

The serial number on a bill consists of a letter followed by seven digits and then a letter. How many different serial numbers are possible, given the following conditions? (a) Letters and digits cannot be repeated.

Can someone tell me how to solve 3x-2y=-7?

How do you write the product of seven and F is reduced by eight as an equation

S=2 times 3.14 times radius times height + 2 times 3.14 times radius squared Whats that height

A cube is dilated by a factor of 2. How many times larger is the volume of the resulting cube than the volume of the original cube?

P + 8 > - 4 can you guys explain this step by step?

Order from least to greatest: 1/2 3/2 2/5 1/3 (A) 3/2 1/2 2/5 1/3 (B) 3/2 1/2 1/3 2/5 (C) 1/3 2/5 1/2 3/2 (D) 2/5 1/2 1/3 3/2

What percent is 248?

The formula m = 12,000 + 12,000rt 12t gives Keri's monthly loan payment, where r is the annual interest rate and t is the length of the loan, in years. What is Keri's monthly loan payment if she gets a 5% loan for 4 years? $ per month