One variable expressions

11x=33

8 + B =45

Susan has 5 friends, she spent $45 dollars in total in order to buy each friend a ticket. How much did each ticket cost?

If David has a total of $981 dollars in the bank and he spent (x) amount of dollars, how much money will he have left if he purchased 8 basketballs that cost $2 dollars each?

Evaluate the expression 5j+4, where j=1, j=7, j=10