Mary spent a total of $292.04 for a party. she spent $200.21 on food, plus an additional $30.61 for each hour of the party. how long was the party?

Ineed with number 6 , explain how to get 1978

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.

Which expression represent a number that is one fourth as great as 10-2a. (10-2)+4b. (10-2)÷4c. (10-2)-4d. (10-2)×4