Un niño amarra una soga a una piedra como se muestra en la gráfica. La piedra realiza un Movimiento circular uniforme variado y tarda 4 segundos en ir desde el punto A hasta el punto B. Calcular el módulo de la aceleraracion tangencial que experimenta

Radii ok and nl are perpendicular to om because of the radius-tangent theorem. by definition of perpendicular, angles kom and lnm are right angles. this means that triangles kom and lnm are right triangles. angle lmn is common to both right triangles, so by the triangles kom and lnm are similar.

Which of the following is true for the relation f(x)=2x^2+1

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?