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# Mat 219 Questions 153 158 Essay

551 words - 3 pages

MAT/219
Chapter 5.7 Questions 153-158

153. Explain the negative exponent rule and give an example.

The negative exponent rule A-n = 1/an, means that the negative exponent in the
numerator is to be switched/moved to the denominator side to be converted into a
positive exponent. When there is a negative exponent is gets moved to the numerator
and then becomes a positive exponent. You should only move negative exponents.

EX: 5-2= 1/5-2 = 1/25
4x-2 = 4/x-2
X-3/Y-7 = Y7/X3

154. How do you know if an exponential expression is simplified?

The easiest way to know when an exponent is simplified is when the X in the
expression has an exponent attached to it.

155. How do you know if a number is ...view middle of the document...

156. Explain how to convert from scientific to decimal notation
and give an example.

When you see a scientific notation and it shows you x 106, the exponent is telling you how many places you need to move. example 4,695 X 106 will turn into 4,695,000. This mean that you need to move the decimal point depending on if the exponent is positive or negative. if the power is negative than you would move the decimal to the left, if positive you would move it to the right. example .000004695.

157. Explain how to convert from decimal to scientific notation
and give an example.

To reverse and convert a decimal to scientific notation you will do the opposite. first you will need to count how many times you will need to move the decimal point to make it a number between 1 and 10 and which you would then make that to the power of 10.

Example: .0000023 you will need to move the decimal point 5 places to the right so that you get a number between 1 and 10 making it 2.3 turning your conversation into 2.5x10-5

158. Describe one advantage of expressing a number in scientific
notation over decimal notation.
When you have a really large number you still end up with all of the zeros, this can cause problems when working with the numbers because the zeros can be miscounted and or lost. in scientific location you are using the exponent to hold your zeros in a simple and easy form so you can make and equation or number smaller.
Example: 35,000,000,000,000,000,000,000 can be 3521 making this large number smaller. although decimal notation will also give you a smaller number the scientific notation method will make the numbers easier to read and work with.

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