When a number is multiplied by -2, the result is at least 18. what is the most the number can be?

(1,4) is on graph of f(x)

f(1) = 4

so 1/4 f(x)

1/4 f(1)

1/4. ×4

1

so point for function 1/4. f(x) is (1,1)

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.