Use complete sentences to describe why √ -1≠-√ 1

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?