Given f(x) = x2 – 3 and g(x) = x+2 x. Find (g ° f)(4). please help

For the given quadratic equation convert into vertex form, find the vertex and find the value for x=6 y=-2x^2+2x+2

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2