Lesson 5 Review

A computer performs a task in 3 x 10^-5 seconds. How long does the computer need to do 9 x 10⁶ tasks? Write your answer in STANDARD FORM.

• 120 seconds

• 270 seconds

• 60 seconds

A hand soap store sold 7.63x10³ bottles in JANUARY and 1.089x10⁴ bottles in FEBRUARY.

How many more bottles were sold in FEBRUARY than JANUARY?

• 8.719x10⁴ bottles

• 6.541x10³ bottles

• 3.26x10³ bottles

Bath and Body Works sold 1.089x10⁴ bottles in FEBRUARY and 4.58x10³ bottles in March.

How many more bottles were sold in FEBRUARY than MARCH?

• 17.2x10³ bottles

• 6.31x10³ bottles

• 3.491x10⁴ bottles

The hand soap sold the following amounts of hand soap:

7.63x10³

1.089x10⁴

4.58x10³

How much soap did they sell in all?

• 10.89x10⁴

• 23.1 x10³

• 2.31x10⁴

Light travels at 2.998x 10⁵ kilometers per second. There are 6.048x 10⁵ seconds in a week. How far does light travel in one week?

• 18.13 x 10¹⁰ kilometers

• 1.81x10¹¹ kilometers

• 9.046x10¹⁰ kilometers

Redo this problem correctly: (4 x 10¹¹)(3 x 10^-14) + 0.000005= 1.7 x 10^-6. Is this correct?

• Yes

• No

Solve the following equation:

(6 x 10¹⁷) + (2 x 10¹⁵)/(2 x 10^-6)

• 3.1 x 10²²

• 31 x 10²¹

Solve the equation: (3 x 10⁵) (6 x 10²)

• 1.8 x 10⁸

• 18 x 10⁷

• 9 x 10⁷

Solve:

(2 x 10⁸)/(4 x 10^-2)

• 2 x 10¹⁰

• .5 x 10¹⁰

• 5 x 10⁹

Solve:

(8.1 x 10⁹) + (4.3 x 10⁷)

• 8.143 x 10⁹

• 814.3 x 10⁷

• 3.483 x 10⁷