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ACT Math 4.2 Elementary Algebra
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ACT Math Elementary Algebra Drill 4, Problem 2. Solve for x.

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ACT Math: Pre-Algebra Drill 2, Problem 1. Solve for x in this equation.

ACT Math 2.2 Pre-Algebra
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ACT Math Pre-Algebra: Drill 2, Problem 2. Solve for y.

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SAT Math 1.4 Numbers and Operations 211 Views


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Description:

SAT Math 1.4 Numbers and Operations. Solve the equation.

Language:
English Language

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,

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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