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)
1.25×10^−11 by 2.5×10^−9 millimeters
1.25×10^−10 by 2.5×10^−8 millimeters
1.25×10^−6 by 2.5×10^−4 millimeters
1.25×10^−5 by 2.5×10^−3 millimeters
1.25×10^−5 by 2.5×10^−3 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)
0.399×10^6 seconds
3.99×10^3 seconds
3.99×10^5 seconds
3.99×10^4 seconds
3.99×10^4 seconds
Calculation: 1900 songs * 3.5 minutes/song * 60 seconds/minute = 3.99 x 10^4 seconds
In government class, Nadia computed the amount of debt of the federal government after a third of it was paid in 1995. The calculator displayed the number 3.28E12. What is this number in scientific notation?(1 point)
3.28+10^12
3.28×10^−12
3.28×10^12
12×10^3.28
3.28×10^12
Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5×10^9 years. The half-life of Uranium-233 is 1.6×10^5 years. He computed how much greater the half-life of Uranium-238 is than that of Uranium-233, and his calculator displayed the number 2.81E4. What is this number in scientific notation?(1 point)
2.81×10^−4
2.81×10^4
4×10^2.81
2.81+10^4