I really need help with these practice questions please .

There are no points of inflection for f (a) = -4x. True FalseTo find the x-intercept of a function, set X - O and solve for y True FalseIf f ( a) = -2x2 + x, then f (x) = -4x + 1. C True FalseGiven the function f ( x ) = x2+1 , determine the interval(s) of concavity. O Concave up: 3 Concave up: - 3 = Concave up: I V3 Concave down: V3 3 3 Concave down: - 3 0, what can you tell about the graph of f (ac)? Of' (x) is increasing, f (a) is concave up Of'(x) is decreasing, f() is concave down Of'(a ) is increasing, f () is concave down Of' (x) is decreasing, f(a) is concave up