Which expression is equivalent to 30(1/2x-2)+40(3/4y-4)?

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.

How do i put 3(x+7) in distributive property

If f(x)=x+7 and g(x)=1/x what is (fog)(x)