F(x) = -2x^2 + 12x + 3
Find the a, b, and c

Need on this one asap im almost done with this subject

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute