The sinusoidal function f(x)=42sin(9x−π10)+42 models the height, in centimeters, that a valve stem of the a tire is above ground x seconds after the tire begins to rotate. How long does it take the valve stem to complete one revolution?

Enter your answer, rounded to the nearest hundredth of a second, in the box.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

answer: they are supplementary angles

step-by-step explanation: 161+19=180. supplementary angles equal 180 degrees

i think the answer is b x = 1, y = 35/2