What is the answer to 1 over 4 with an exponent of -2

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?

Someone me what is the area of this figure? 18m 18m 8m 16m

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.