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ACT Math: Pre-Algebra Drill 2, Problem 1. Solve for x in this equation.
ACT Math: Pre-Algebra Drill 4, Problem 3. Simplify the expression.
SAT Math 1.4 Numbers and Operations 220 Views
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Description:
SAT Math 1.4 Numbers and Operations. Solve the equation.
Transcript
- 00:02
And here's your shmoop du jour...
- 00:04
What is 1.2 times 10 to the fifth over 2.4 times 10 to the 8th?
- 00:08
Here are the potential options...
- 00:12
You're probably reaching for your calculator right now, but no calculator necessary here.
- 00:16
In order to solve this unholy mess of numbers,
Full Transcript
- 00:20
we need to split it into its parts: 1.2 divided by 2.4 is 0.5.
- 00:26
Our exponent rules tell us that dividing numbers with exponents
- 00:30
means subtracting the exponents themselves.
- 00:34
5 - 8 = -3 and we have 0.5 times 10 to the negative third.
- 00:41
0.5 times 10 to the negative third is equal to zero-point-zero-zero-zero-five...
- 00:49
...so (A) is the correct answer.
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