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alina1380 [7]
3 years ago
7

Put a check by the three numbers that are prime numbers. 1 7 15 21

Mathematics
2 answers:
Mrac [35]3 years ago
7 0
Seven is the only prime number here
Aleks04 [339]3 years ago
4 0

Answer:

1

7 ✔️

15

21

Only 7 is a prime number in this question.

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HELP PLEASE
Radda [10]
Remark
The general equation for an ellipse is
\frac{x^2}{a^2}+ \frac{y^2}{b^2}=1 

At the center, the the point is 0,27

Solving for the 
\frac{0}{a^2} +  \frac{27^2}{b^2} = 1
or b^2= 27^2 * 1
Taking the square root of both sides 
b = 27

Now we need to use one more piece of information
The second point is (24,9) what that means is at the point x = 24, y = 9

Solving for that 
\frac{24^2}{a^2}+\frac{9^2}{27^2}=1

576/a^2 + 81/729 = 1    Subtract 81/729 from both sides
576/a^2 = 1 - 81/729 = 576/a^2 = (729 - 81)/729 = 648 /729

576/a^2 = 648/729     Cross multiply

648 a^2 = 729 * 576   Divide by 648
a^2 = 648            

Full equation for the ellipse and answer is

\frac{x^2}{648}+ \frac{y^2}{729} = 1


 

7 0
3 years ago
Read 2 more answers
Matthew and Andrew leave an intersection at
cestrela7 [59]
d i believe so it might be d if not i’m sorry
3 0
2 years ago
Multiply 5.46 × 12.9 = ____ PLS HELP FAST
dmitriy555 [2]

Answer:

Your answer would be 70.434! Sorry if its wrong, but im sure its right!

I'd wait for somebody else to answer just to confirm!

7 0
3 years ago
Write the number 3,2 and 8 in a addition sentence. Show two more ways to find the sum
Kisachek [45]
1.(3 + 2) + 8

2.5 + 8
4 0
3 years ago
Write an equation with the solution x=20??
Art [367]
Let's just start with x=20 and then do some algebra to it to make it all complicated
x = 20
2 * x = 2 * 20
2x = 40
2x - 13 = 40 - 13
2x - 13 = 27
5 0
2 years ago
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