7.8 + 2(0.75m + 0.4) = -6.4m + 4(0.5m - 0.8) Mia solved the equation and determined that m = 2. Is she correct?

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

What is the total surface area of this square pyramid?