Which statements describe the graph of y = 4x2 + 28x + 49? check all that apply.
the graph has two x-intercepts because 4x2 + 28x + 49 has two different factors.
the equation 2x + 7 = 0 can be used to find a zero of the function.
the equation (2x – 7)2 = 0 can be used to find the y-intercept.
the graph has a double root at x = .
the graph intersects the y-axis at y = 49.

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.