What is the principal amount if the interest rate is 3.5% a year and the amount of interest is 183.75 for 21 months?

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?

Ten times the square of a non-zero number is eqaul to ninety times the number

What is perpendicular to y=-1/2x+11