Someone help me on the first one

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

The monetary value earned for selling goods or services to customers is called a.) revenue b.) assets c.) money d.) accounting