A clock is positioned on an auditorium wall with its center 9 ft above the floor. The second hand on the clock is 10 inches long and continuously moves around the clock. Let x represent the time in seconds measured from noon on a given day. Which function f(x) represents the height above the floor, in feet, of the tip of the second hand?

B : y=5/6cos(pi/30x)+9

Step-by-step explanation:

Edge 2020

B y=5/6cos(pi/30x)+9

Step-by-step explanation:

A clock is positioned on an auditorium wall with its center 9 ft above the floor. The second hand on the clock is 10 inches long and continuously moves around the clock.

Letting x represent would be B, B best represents the height above the floor in feet of the tip of the second hand.

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.