The height of an airplane during a landing is given by 22,000+(-480t)where t is the time and minutes, how many minutes it takes the plane to land to the nearest hundredth of a minute.

We are given the equation:

h = 22,000 – 480 t

where h is height . The plane will land when h = 0, therefore:

0 = 22,000 – 480 t

480 t = 22,000

t = 45.83 minutes

hence the plane will land after 45.83 minutes

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb