John had 20$ he bought a drink for 2$ and a candy bar for 1$ how much does John have left?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

(! ) three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder

Student price tickets to a movie are $1 and non student tickets are $2. 350 tickets are sold and the total amount made is $450. how many non student tickets were sold ? a) 100 b) 150 c) 200 d)250