Which one of the numbers is not written in scenintific notation A: 0.1 x 10 to the 3rd power
B: 3.2 x 10 to the 3rd power
C: 2.1 x 10 to the second power
D: 5 x 10 to the second power

A: 0.1 x 10 to the 3rd power

Step-by-step explanation:

it will be decay because it is lower than 1 which means that it will decrease the answer not increase it.

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours