Prove cos (x+y) + cos (x-y) = 2cosxcosy

How do I solve this equation: -5 (n-1) = 7 (n+3)

Glenys, Karen, Nicola, Philippa and Shirley enjoy healthy snacks on their daily tea break. There are 5 different pieces of fruit left in the Common Room fruit bowl: an apple, a banana, a nectarine, an orange and a plum.

Form a biconditional statement using p: an angle is acute q: an angle measures between 0 and 90 degrees using "if and only if"

Find the value of c that completes the square. x'2+42x+C

300 students were surveyed. 240 completed the survey. What is the percentage of students surveyed

You drive your car 4.5 hours at an average speed of 70 miles per hour. How far did you go

Rewrite the function by completing the square. g (x) = x2 + 152 + 54

Value of sin 440 degrees?

The perimeter of a stop sign with 8 sides of equal length is given by the expression 8n. What does the variable n represent?

How are the formulas for the volume of a cylinder, pyramid, and cone derived?