Evaluate the expression 8.2(5)^2

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

Erik buys 2.5 pounds of cashews. if each pound of cashews costs $7.70, how much will he pay for the cashews?

Roy has 4 1/2 pizzas for the soccer team to split after the game. if each member is going to get 1/2 of a pizza, how many players are on the soccer team