Hello There!
12 + 2n = 20
-12 -12
2n = 8
/2 /2
n = 4
Option D.
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- Hannah ❤
Answer:
$15.90
Step-by-step explanation:
$1.20 x .25 is the cost of 1/4 pound = $ 0.30
13 lbs × 1.20 = $15.60
15.6 + .3=15.9
To decompose a fraction to one whole, there are different methods to use. The fraction can be decomposed either by division, multiplication(if there are more than one fraction), or addition(if there are more than one fractions).
Example:
Given 8/2, decompose by division:
To do this, divide the numerator by denominator
Imagine, at the first day you have only one penny. Then tomorrow you have 2 pennies, next day you have 4 (2x2), next day you have 8 (4x2), next day you have 16 (8x2).... and so forth.
It looks like geometric sequence isn't it? (the ratio between the number of pennies that you have from the 2nd day and the 1st day is 2)
So, by using geometric sequence theorem we can total those pennies until day-27
S (total pennies at day-27) = (1)(2^27-1) / 2-1 = 2^26 pennies
So, you have 2^26 pennies.. a big number of pennies huh?=))
{The formula is: S = a( r^n-1) / r-1
Where:
a= the number of pennies that you've got at the 1st day
n= number of days you spent to collect those pennies)
r= the ratio of the number of pennies}
Seismometers measure: Body and surface waves
Do most damage above ground: surface waves
Can travel through liquids solids and gases: S waves
Only travel through solids: P-waves