HEL PLEASE!! Find the discounted price of a $90 calculator that is on sale for 25% off.

Answers listed:
$22.50
$67.50
$89.75
$65.00

Awrestling tournament begins with 128 competitors. in the first round, each competitor has 1 match against another wrestler. the winner of each match moves on to the next round until there is a winner. write a sequence in which the terms represent the number of players still in the tournament at the end of each round. describe the sequence? how many rounds are in the tournament?

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

In the equations, a and b represent the price per night for a room in hotel a and hotel b, respectively, w weeks after september 1 last autumn. what was the price per night in hotel a when it was equal to the price per night in hotel b? a = 240 − 20w b = 320 − 30w