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Do you know how to multiply scientific notation?
i have the ti-84 calculator that multiplies things
Right, but we want to multiply it without expanding it. Do you know how to multiply the numbers keeping them in scientific notation?
Okay. First, we multiply the decimal number. After, we keep the base of ten and add the exponents (since we add exponents when multiplying the same base)
What do you get?
so do i multiply 3.9 times 1.55?
and with the expontents part it will be 10^40
Yep! So your answer is 6.045 x 10^40
As for part B, remember that a negative exponent on ten means that the number is less than 1 and any positive exponent is equal to or greater than 1.
SO i multiply 1.6 ties 1.6??
No. It's asking you to chose between two measurements for the distance between two tracks on a CD.
I think 1.6 time 10^3
1.6 x 10^3 mm = 1.6 meters 1.6 x 10^-3 mm = 0.0016 mm. In the scale of a CD, which one would be logical?
first one ?
Yes. But do you see why it is?
Yea because tracks are like the song and it takes longer time to switch between them
Also, because a CD is nowhere near 1.6 meters in diameter.