What is the first step to solve for 9 − 4 = 18?

Can someone me with my hwplz(only the circled ones)

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.

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41