How many inches is each slice of pizza?

Hey!

First, let's find the area. The formula for finding area of a circle is: π · r²

Radius is ½ of the diameter. Divide the diameter by 2 to get the radius.

d = 18

18 ÷ 2 = 9

r = 9

r² = 9 × 9 = 81

The area of the whole pizza is 81π. There are 10 slices. Divide the area of the whole pizza by 10 to find the area of 1 slice.

81π ÷ 10 = 8.1π

That means each slice is 8.1π inches²

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.

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step-by-step explanation: