Which graph represents a line with a slope of -2/3 and a y-intercept equal to that of the line y = 2/3x - 2?

Which function has the smallest y-intercept value

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)