A jar contains only pennies, nickels, dimes, and quarters. There are 24 pennies, 29 dimes, and 12 quarters. The rest of the coins are nickels. There are 80 coins in all. How many coins are nickels? if n was the number of nickels in a jar, what equation could you use to find n? A. n + 65 = 80
B. n - 68 = 80
C. n - 51 = 80
D. n + 56 = 80
E. n + 51 =80
F. n + 68 = 80

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?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?