7c^2+5/4a-b if a=1, b= -5 and c=-4

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

(c) the diagram shows the first three shapes of a matchsticks arrangement. first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.