Can someone please help me with math thank you

If the discriminant if a quadratic equation is 4 which statement describes the roots?

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?