Without using a calculator, find the largest prime factor of 15^4 + 2 * 15^2 + 1 - 14^4?

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?

What does the sign of the slope tell you about a line?

Can someone me with my math problem pls my teacher is on my back about this