Can y’all help. Algebra is stressing me out.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

You love to play soccer! you make a shot at the net 8 times during a game! of those 8 attempts, you score twice. what percent of the time did you score?

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 4