The sum of three numbers is 81. the second number is twice the first, and the third number is six more than the second. find the number

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

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.