Answer:
-40
Step-by-step explanation:
-7 x 7 + 9 x (-1) / (-1)
-49 + 9 x (-1) / (-1)
-49 - 9 / (-1)
-49 + 9
= -40
Answer:
WEDNESDAY: 45 planted.
THURSDAY: 22 Harvested.
Step-by-step explanation:
Based on the information given in the problem, Maeve plants 5 trees for every 2 tree she harvests. Then the ratio can be expressed as following:
or ![\frac{5}{2}](https://tex.z-dn.net/?f=%5Cfrac%7B5%7D%7B2%7D)
Then, you can complete the values in the table as you can see below:
<u>WEDNESDAY</u>
![\frac{5}{2}=\frac{planted}{18}\\\\planted=\frac{18*5}{2}\\\\planted=45](https://tex.z-dn.net/?f=%5Cfrac%7B5%7D%7B2%7D%3D%5Cfrac%7Bplanted%7D%7B18%7D%5C%5C%5C%5Cplanted%3D%5Cfrac%7B18%2A5%7D%7B2%7D%5C%5C%5C%5Cplanted%3D45)
<u>THURDAY</u>
![\frac{5}{2}=\frac{55}{harvested}\\\\(harvested)(\frac{5}{2})=55\\\\harvested=\frac{55*2}{5}\\\\harvested=22](https://tex.z-dn.net/?f=%5Cfrac%7B5%7D%7B2%7D%3D%5Cfrac%7B55%7D%7Bharvested%7D%5C%5C%5C%5C%28harvested%29%28%5Cfrac%7B5%7D%7B2%7D%29%3D55%5C%5C%5C%5Charvested%3D%5Cfrac%7B55%2A2%7D%7B5%7D%5C%5C%5C%5Charvested%3D22)
Answer:
B. 5.0 × 10⁻¹² moles per liter.
Step-by-step explanation:
In this exercise we have to calculate the pH levels associated with respective hydrogen ion concentration based on the following formula:
Where
is the hydrogen ion concentration, measured in moles per liter.
a) 3.5 × 10⁻¹⁶ moles per liter:
![pH=-\log [3.5\times 10^{-16}]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5B3.5%5Ctimes%2010%5E%7B-16%7D%5D)
![pH \approx 15.456](https://tex.z-dn.net/?f=pH%20%5Capprox%2015.456)
The substance is above the upper bound for alkaline substances.
b) 5.0 × 10⁻¹² moles per liter:
![pH=-\log [5.0\times 10^{-12}]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5B5.0%5Ctimes%2010%5E%7B-12%7D%5D)
![pH \approx 11.301](https://tex.z-dn.net/?f=pH%20%5Capprox%2011.301)
The substance is alkaline.
c) 1.0 × 10⁻⁷ moles per liter:
![pH=-\log [1.0\times 10^{-7}]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5B1.0%5Ctimes%2010%5E%7B-7%7D%5D)
![pH= 7](https://tex.z-dn.net/?f=pH%3D%207)
The substance is not acid nor alkaline.
d) 1.1 × 10⁻⁴ moles per liter:
![pH=-\log [1.1\times 10^{-4}]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5B1.1%5Ctimes%2010%5E%7B-4%7D%5D)
![pH \approx 3.959](https://tex.z-dn.net/?f=pH%20%5Capprox%203.959)
The substance is acid.
Thus, we concluded that correct answer is B.
Answer:4+3=7
Step-by-step explanation:63/7 = 9 (one part)
3 = 27
4 = 36
36+27 = 63
Answer:
apparently 4.7 because the digital after . don't have a value