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tatuchka [14]
3 years ago
9

Explain why fish are OK with a single pump system but humans need a double pump system.

Mathematics
1 answer:
Lelu [443]3 years ago
8 0

Answer:

A closed circulatory system can have a single or double circulatory pattern. Fish have a single circulatory pattern, wherein the blood passes through the heart only once during each complete circuit. Oxygen-deprived blood from the body tissues comes to the heart, from where it is pumped to the gills.

Step-by-step explanation:

i looked it up

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What's the equation of the line that's a perpendicular bisector of the segment connecting C (6, –12) and D (10, –8)? answers: A)
vitfil [10]

Answer:

A

Step-by-step explanation:

Perpendicular bisector of a line divides the line into 2 equal parts and it is perpendicular to the line.

First let's find the midpoint of CD. The point is where the perpendicular bisector will cut through the line.

midpoint= ( \frac{x1 + x2}{2} ,  \frac{y1 + y2}{2} )

Thus, midpoint of CD

= ( \frac{6 + 10}{2} , \frac{ - 12 - 8}{2} ) \\  = ( \frac{16}{2} , \frac{ - 20}{2} ) \\  = (8, - 10)

Gradient of line CD

=  \frac{y1 - y2}{x1 - x2}  \\  =  \frac{ - 12 -  ( - 8)}{6 - 10}  \\  =  \frac{ - 12 + 8}{ - 4} \\  =  \frac{ - 4}{ - 4}  \\  = 1

The product of the gradients of perpendicular lines is -1.

gradient if perpendicular bisector(1)= -1

gradient of perpendicular bisector= -1

y=mx +c, where m is the gradient and c is the y-intercept.

y= -x +c

Subst a coordinate to find c.

<em>Since the perpendicular bisector passes through the point (8, -10):</em>

When x=8, y= -10,

-10= -8 +c

c= -10 +8

c= -2

Thus, the equation of the perpendicular bisector is y= -x -2.

5 0
3 years ago
5. The zoo fed the large animals 680 pounds of food last week. Seven large animals each ate the same amount while the elephant a
vredina [299]

Answer:

Each of the 7 large animals ate 71 lbs of food.

Step-by-step explanation:

There was a total of 680 lbs of food, and the elephant ate 183 lbs by itself. This means that there was 497 lbs of food left for the 7 large animals. To find out how much food each of the 7 animals ate, we just divide. 497 lbs of food divided by 7 large animals. This will give us a final result of 71 lbs of food per large animal.

8 0
3 years ago
Help please I'm begging someone to give me the right answer please!!!
PtichkaEL [24]
I cannot see the mass of the moon, can you comment the two masses so I can explain?
8 0
3 years ago
Someone please help me answer this!!
dybincka [34]

Answer:

17.9 units is the answer

Step-by-step explanation:

points are (-7,-2) and (9,6)

Pythagorean theorem can be written as,

d=\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2} \\\\d=\sqrt{9-(-7))^2 + (6-(-2))^2}\\\\d=\sqrt{(16)^2+(8)^2} \\\\d=\sqrt{256+64} \\\\d=\sqrt{320} \\\\d=17.88

Rounding off,

d = 17.9 units

7 0
3 years ago
To be clear i don't want the flat out answer i want help on how to solve it .
liberstina [14]
The answer to the problem is as follows:

<span>So each thing separate by a positive, negative, multiplication or division sign. so here it would be 8h is one term and 15t is the second term so there are two.
</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
4 0
3 years ago
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