Explain why algebra problems involve letters

Which expression is equal to sin 75°? sin 135° cos 60° - cos 135° sin 60° cos 135° cos 60° + sin 135° sin 60° sin 135° cos 60° + cos 135° sin 60° cos 135° cos 60° - cos 135° cos 60°?

Is 2/7 greater than 1/4

Rita wants to buy a sweater for $25.00 but the sale is 50% off how much will it cost

What are the domain and range of f (x) = |x + 6|

Jin spent 32hours on math and art homework last week She spent about 30 percent of this total on math. About how many hours were spent on Math?

How many real roots does the function f (x) = x^2+8x-2

2 is subtracted from a number and then the difference is multiplied by 5 the result is 30 find the number

If i have 2 apples and eat one and give the other away how many are their.

A jewelery store is selling 4 pairs of jemstone ear rings for 58$ including tax. neva and three of her friends want to buy the set so each could have one pair of earrings write and solve a multiplication expression

A clothing store used the sign shown below advertise a discount on shirts buy two shirts get the third half off. ky buys three shirts, which were originally $49.96 each. the store will discount the price of the third shirt and then apply a 7.