What is the volume of the cylinder shown below

 The correct option is (A)

Step-by-step explanation:  We are given to find the volume of the cylinder shown in the figure.

We know that

the VOLUME of a cylinder with radius r units and height h units is given by

In the given cylinder, we have

radius, r = 9 units   and   height, h = 5 units.

Therefore, the VOLUME of the cylinder will be

Thus, the required volume of the cylinder is

Option (A) is CORRECT.

"if it is my birthday, then it is snowing"

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.