I just need to figure out why the rule to get the answer is correct. the equation is 1/x^-m=x^m and i know the answer is x^m but why do I need the rules in order to answer them.

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?

Select all the statements that apply to this figure

If my mom gets $13.05 an hour, and she works from 3: 30 to 10: 45 in the morning, how much money does my mom make?