What múltiples to 70 and adds to 19

Is the power produced directly proportional to the wind speed, give reasons for your answer?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Iam at home. /: i am playing video games. translate the following statement into symbolic form.