What is the correct equation for the function whose graph is shown?

a. y = -5 cos 3x
b. y = -3 cos 5x
c. y = 3 cos 5x
d. y = 5 cos 3x

i know its either b or c. but i'm not sure which one relating to the positive/negative 3.

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Carmen ayer en el mercado compro 3/4 kg de guayabas, 6/8 kg de peras, 1/2 kg de naranjas ¿cuantos kilogramos de fruta compro?

Solve -.016x= -16. need solving this