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kompoz [17]
3 years ago
7

Is 63 a prime or composite number

Mathematics
2 answers:
egoroff_w [7]3 years ago
8 0
63|3 \\ 21|3 \\ 7 \ |7 \\ 1 \\\\ 63=3^2*7 \\\\ 63-composite \ number \ because \ it \ can \ be \ divided \ by \ D_{63=\{1;3;7;9;21;63 \}
notsponge [240]3 years ago
3 0
The answer is composite because a prime number is only divisible by 1 and itself. You can divide sixty-three by 9, 7,21,3,63, and 1.
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A tap takes 3 hours to fill a tank. A discharge tap takes 6 hours to empty the same tank. How long will it take to fill the tank
wlad13 [49]

Answer:

2 hours

Step-by-step explanation:

first tap= 3hours

therefore work done is = 1/3

second tap= 6hours

therefore work done = 1/6

so, 1/3+ 1/6

=2/6 + 1/6

=3/6

=1/2

=2/1 hours

=2 hours

8 0
3 years ago
X-y+z=-4<br><br> 3x+2y-z=5<br><br> -2x+3y-z=15<br><br> How do I solve this?
Lera25 [3.4K]
1)\ \ \ x-y+z=-4\ \ \ \Rightarrow\ \ \ z=-4-x+y\\\\2)\ \ \ 3x+2y-z=5 \\.\ \ \ \  \Rightarrow\ \ 3x+2y-(-4-x+y)=5 \\.\ \ \ \  \Rightarrow\ \ 3x+2y+4+x-y=5 \\.\ \ \ \  \Rightarrow\ \ 4x+y=1\\\\3)\ \ \ -2x+3y-z=15\\.\ \ \ \  \Rightarrow\ \ -2x+3y-(-4-x+y)=15\\.\ \ \ \  \Rightarrow\ \ -2x+3y+4+x-y=15\\.\ \ \ \  \Rightarrow\ \ -x+2y=11\\--------------------\\

z=-4-x+y\\.\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ and\\ \left \{ {{4x+y=1\ \ \ \ } \atop {-x+2y=11\ /\cdot4}} \right. \\\\\left \{ {{4x+y=1\ \ \ \ } \atop {-4x+8y=44}} \right. \\-------\\y+8y=1+44\\9y=45\ /:9\\y=5\\\\-x+2y=11\ \ \ \Rightarrow\ \ \ x=2y-11\ \ \ \Rightarrow\ \ \ x=2\cdot5-11=-1\\\\z=-4-x+y=-4-(-1)+5=-4+1+5=2\\\\Ans.\ x=-1\ \ \ and\ \ \ y=5\ \ \ and\ \ \ z=2
5 0
3 years ago
If the perimeter of the polygon is 42, AB = ______?
Simora [160]

Answer:

7

Step-by-step explanation:

Total sides = 6 *hexagon* (6 sided shape)

Divide the total perimeter by the many number of sides:

42(total) divided by 6(6 sides in total) = 7.

Therefore AB is 7

6 0
3 years ago
Read 2 more answers
What are the x-intercepts of the following graph? On a coordinate plane, a parabola opens down and goes through (negative 2, 0),
Natasha2012 [34]

Answer:

b

Step-by-step explanation:

I think so because its bigger than A but they both are x I'm pretty sure but b I think is the answer

8 0
2 years ago
Mel makes and sells pet treats at a local pet fair. He earns $6.25 for each bag of treats he sells. He wants to sell enough trea
Law Incorporation [45]

Answer:

A.)  

240/6.25=d

B.)

Mel would have to sell 39 bags

This is because if we divide 240 by 6.25 we get 38.4

We can not sell .4 bags, so we have to round up

So we have to sell 39 bags

Mel will also have 3.75 dollars left over

C.)

My answer is reasonable. Mel will have to sell 39 bags of dog treats. Since he wants to get 240 dollars, then he must earn 240 dollars. He earns 6.25 per bag. So you need to find out how many bags he needs to sell. To do this, you divide the amount of dollars by the amount you are selling the bags for. So 240 divided by 6.25. To check, you could times 6.25 by 39 and make sure that it i over 240 dollars.

5 0
2 years ago
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