Afood packet is dropped from a helicopter and is modeled by the function f(x) = -16x2 + 14400. the graph below shows the height f(x), in feet, of the food packet at different times x, in seconds: use the graph to determine the reasonable domain of f(x) based on the context. 0 ≤ x ≤ 30 0 ≤ x ≤ 14400 -30 ≤ x ≤ 30 all real numbers

answer: 12

step-by-step explanation:

because yes

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15