Guided Practice Use the formula to estimate the temperature when n = 120 chirps/min. Round to the nearest whole number, if necessary.

The forumla F = n/4 + 37 estimates the temperature F in degrees Fahrenheit when crickes chirp n times per minute.

A.
157°F

B.
67°F

C.
39.25°F

B.

67°F

Step-by-step explanation:

I'M SORRY BUT I CAN'T FIND IT ANYWHERE AND I HAVE NO IDEA WHAT IT IS

a

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this