Ke'Andre joined the swim team. His high dive jump is modeled by the following equation: f(x) = -16x2 + 24x +6. How high up will Ke'Andre be after 1 second?

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Select a graph that have an equation with a < 0

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?