Answer:
The total change in water level over the past 2 years is
.
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
- Brackets
- Parenthesis
- Exponents
- Multiplication
- Division
- Addition
- Subtraction
Fractions
Numbers
- Least Common Multiple (LCM)
Step-by-step explanation:
<u>Step 1: Define</u>
<em>Identify</em>
Year 1 water change: ![\displaystyle -2 \frac{1}{3}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20-2%20%5Cfrac%7B1%7D%7B3%7D)
Year 2 water change: ![\displaystyle -1 \frac{5}{6}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20-1%20%5Cfrac%7B5%7D%7B6%7D)
<u>Step 2: Find Total Water Change</u>
- [Set up] Add yearly water changes:
![\displaystyle -2 \frac{1}{3} + -1 \frac{5}{6}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20-2%20%5Cfrac%7B1%7D%7B3%7D%20%2B%20-1%20%5Cfrac%7B5%7D%7B6%7D)
- [Fractions] Convert to improper:
![\displaystyle \frac{-7}{3} - \frac{11}{6}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B-7%7D%7B3%7D%20-%20%5Cfrac%7B11%7D%7B6%7D)
- [Fraction] Rewrite [LCM]:
![\displaystyle \frac{-14}{6} - \frac{11}{6}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B-14%7D%7B6%7D%20-%20%5Cfrac%7B11%7D%7B6%7D)
- [Order of Operations] Subtract:
![\displaystyle \frac{-25}{6}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B-25%7D%7B6%7D)
- [Fraction] Convert to proper:
![\displaystyle -4 \frac{1}{6}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20-4%20%5Cfrac%7B1%7D%7B6%7D)
Answer:
P = 1 / 6
Step-by-step explanation:
Given:-
- A deck has 500 cards
- Numbered from 1-500
Find:-
you are asked to pick three cards, one at a time, what's the probability of each subsequent card being larger than the previous drawn card
Solution:-
- Suppose we draw three cards. We don't care what they actually are, irrespective of number.
- Let the three numbers be a, b, c: Such that:
a < b < c.
- The total possible combinations with 3 numbered cards will be:
a b c
b a c
a c b
b a c
b c a
c a b
- We have 6 possibilities for 3 numbered cards. So the probability of of each subsequent card being larger than the previous drawn card would be:
P = 1 / possible combinations
P = 1 / 6
Answer: 9
Step-by-step explanation:
Formula : Mean = ![\dfrac{\text{Sum of observations}}{\text{Number of observaions}}](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Ctext%7BSum%20of%20observations%7D%7D%7B%5Ctext%7BNumber%20of%20observaions%7D%7D)
Given: 5 students participated in a push-up competition.
The amount of push-ups each student completed is listed: 12, 7, 10, 11,5.
Mean = ![\dfrac{12+7+10+77+5}{5}](https://tex.z-dn.net/?f=%5Cdfrac%7B12%2B7%2B10%2B77%2B5%7D%7B5%7D)
![=\dfrac{45}{5}=9](https://tex.z-dn.net/?f=%3D%5Cdfrac%7B45%7D%7B5%7D%3D9)
Hence, the mean number of push-ups = 9