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Daniel [21]
3 years ago
5

What is the respiratory system (anyone free to talk?)​

Mathematics
1 answer:
rosijanka [135]3 years ago
5 0

Answer:

The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history.

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Justin did push-ups for the past 5 days. The following data points are the number of push-ups he did each day.
irga5000 [103]

Answer:

2.67

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
A kayaker spends a morning paddling on a river. She travels 9 miles upstream and 9 miles downstream in a total of 6 hours. In st
tresset_1 [31]
To answer this item, we have 4 as the speed of the kayaker in still water and the speed of current be y.

When the karayaker moves upstream or against the current, his speed would be 4 - y. Further, if he moves downstream or with the current, the total speed would be 4 + y. The time utilized for the travel is equal to the ratio of the distance and the speed. 

 Total time = 9/(4 - y)  + 9/(4 + y) = 6

We multiply the equation by (4-y)(4+y)
              9(4-y) + 9(4 + y) = 6(4-y)(4+y)

Simplifying,
                72 = 96 - 6y²
Transposing all the constants to only one side of the equation and rearranging,
               6y² = 96 - 72
                 y² = 4
                    y = 2

Hence, the speed of the river's current is 2 miles/hr. <em>The answer is letter B.) 2 miles/hour.</em>
5 0
3 years ago
Find the greatest common factor of the following numbers.
densk [106]
2 times 3 times 4 times 4 times 5 equals 480
5 0
3 years ago
<img src="https://tex.z-dn.net/?f=Expand%20%24%28a%20%2B%202%29%283a%5E2%20%2B%2012%29%28a%20-%202%29.%24" id="TexFormula1" titl
sashaice [31]

Answer:

3a^{4} - 48

Step-by-step explanation:

Given

(a + 2)(3a² + 12)(a - 2)

= (a + 2)(a - 2)(3a² + 12) ← expand the first pair of parenthesis using FOIL

=(a² - 4)(3a² + 12) ← expand using FOIL

= 3a^{4} + 12a² - 12a² - 48 ← collect like terms

= 3a^{4} - 48

5 0
3 years ago
Determine whether each equation represents a proportional relationship.
likoan [24]

Answer:

Proportional Relationship: I  Not a Proportional Relationship:

y=1.6x                                  I   y=3/(4x)

y=x                                      I   y=2x+1

y=12x .                                 I   y=3+x

Explanation:

I took the test and that's how i got these answers.

8 0
3 years ago
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