Find the impact on the volume if the dimensions of a right cylinder are multiplied by a scale of 1 half

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

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?

Which of the following is not a subset of {1,2,3}?