A quadratic equation in form ax2+by+c=0 cannot have

Evaluate the expression for the given value of the variable 7a - 4a for a =8

One positive integer is 2 less than another. the product of the two integers is 24. what are the integers?

Yolanda wanted to buy a total of 6 pounds of mixed nuts and dried fruit for a party she paid 21.60 for mixed nuts and 11.90 for dried fruit did yolanda but enough mixed nuts and dried fruit for the party