Problem solving multiplication

Simplify the expression by using a double-angle formula. - 2cos2π91

A shopper uses a department store gift card to pay for 5 sweaters priced at $18 each. What is the change in value of the gift card?

When Elyse moved last weekend, the circular glass top for an end table broke. To replace it, she bought a circular glass top with a diameter of 16 inches. What is the approximate area of the circular glass top Elyse bought? (square cm)

Find the slope of the given line, if it is defined. (if an answer is undefined, enter undefined.) 2x + 3 = 0

Johann walked 1.2 feet per second. how far, in feet did he walk in 5 seconds

What is the prime factorization of 75? write in exponential form

2x4 + 4x3 - 30x2 = 0

Identify the real zeros for f (x) = 3x^2+2x+4

How many solutions does the equation 9x + 3=9x + 5 have?

Burros are amphibians, true or false?