Kendra finds the dimensions of a sticky note. She uses a meter stick to determine that the dimensions are 1.25×10−8 meters wide by 2.5×10−6 meters long. Use scientific notation to write the dimensions in millimeters.
Note: 1 meter is equal to 1,000 millimeters.
(1 point)
Responses
1.25×10−6 by 2.5×10−4 millimeters
1.25 times 10 superscript negative 6 baseline by 2.5 times 10 superscript negative 4 baseline millimeters
1.25×10−5 by 2.5×10−3 millimeters
1.25 times 10 superscript negative 5 baseline by 2.5 times 10 negative cubed millimeters
1.25×10−10 by 2.5×10−8 millimeters
1.25 times 10 superscript negative 10 baseline by 2.5 times 10 superscript negative 8 baseline millimeters
1.25×10−11 by 2.5×10−9 millimeters
1.25 times 10 superscript negative 11 baseline by 2.5 times 10 superscript negative 9 baseline millimeters
Jim’s music library on his phone holds 1,900 songs. The songs have an average time of 3.5 minutes. Use scientific notation to find the total number of seconds the playlist will play. Express the answer to the exact decimal place.(1 point)
Responses
3.99×104 seconds
3.99 times 10 superscript 4 baseline seconds
3.99×105 seconds
3.99 times 10 superscript 5 baseline seconds
0.399×106 seconds
0.399 times 10 superscript 6 baseline seconds
3.99×103 seconds
3.99 times 10 superscript 3 baseline seconds
In chemistry class, Carlos calculated the number of molecules in 100 moles. The calculator displayed the number 6.02E25. What is the number of molecules in 100 moles in scientific notation?(1 point)
Responses
6.02+1025
6.02 plus 10 superscript 25 baseline
6.02×25
6.02 times 25
25×106.02
25 times 10 superscript 6.02 baseline
6.02×1025
6.02 times 10 superscript 25 baseline
To convert the dimensions from meters to millimeters using scientific notation, you need to move the decimal point three places to the right since 1 meter is equal to 1,000 millimeters.
For the width: 1.25 × 10^(-8) meters
To convert to millimeters, you need to move the decimal point three places to the right, resulting in 1.25 × 10^(-8) × 10^3 = 1.25 × 10^(-8+3) = 1.25 × 10^(-5) millimeters.
For the length: 2.5 × 10^(-6) meters
To convert to millimeters, you need to move the decimal point three places to the right, resulting in 2.5 × 10^(-6) × 10^3 = 2.5 × 10^(-6+3) = 2.5 × 10^(-3) millimeters.
Therefore, the dimensions in millimeters using scientific notation are 1.25 × 10^(-5) by 2.5 × 10^(-3) millimeters.