One grade of tea costing $3.20 per pound is mixed with another grade costing $2 per pound to make 20 lbs of a blend that will sell for $2.72 per pound. How much of the $2 tea is needed?

The highest common factor of 132 and 220

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

With #! i’ve tried to figure it out but i can’t.