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lisabon 2012 [21]
3 years ago
10

JUNIOR MATHEMATICAL CHALLENGE

Mathematics
1 answer:
quester [9]3 years ago
5 0

Answer:

all of these are prime numbers

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at a meeting ,everyone shakes hands exactly once with every other person . if there are 55 handshakes . then what Is the number
AlexFokin [52]
11.
Every handshake takes 2. If no one shakes hands twice with another, there are 10+1 total people shaking hands (11).

Name them 1 thru 11. Make a line and 11 goes down the line and shakes 10 hands and then leaves. 10 then shakes 9 hands and leaves. 8 then shakes 7 hands and leaves. Etc. 2 shakes hands with 1 and leaves. 1 just leaves.

11— 10 hs

10— 9 hs

9— 8 hs

8— 7 hs

7— 6 hs

6— 5 hs

5— 4 hs

4— 3 hs

3— 2 hs

2— 1 hs

1— leaves

Total handshakes 55, total people 11.
6 0
3 years ago
What is the median for the data: 13,8,9,16,18
Rom4ik [11]
The median would be 13
6 0
3 years ago
Read 2 more answers
Identify the equation of the circle J with center K(-7,3) and radius 6.
andreyandreev [35.5K]

Answer:

equation of the circle J with center K(-7,3) and radius 6 is=

x^2+y^2+14x-6y+22=0

Step by step explanation:

Equation of circle with given centre (h,k) and radius r is

(x-h)^2+(y-k)^2=r^2

Given centre are K(-7,3) and radius 6.

So equation of Circle=

(x- -7)^2+(y-3)^2=6^2

x^2+14x+49+y^2-6y+9=36

x^2+y^2+14x-6y+22=0 answer

8 0
3 years ago
Read 2 more answers
Find the midpoint of the segment with the following endpoints (-5,-1) and (1,9)
Bogdan [553]

Answer:

(x1,y1),(x2,y2)

(x1,y1)=(-5,-1)   (x2,y2)=(1,9)= (1-5/2, 9-1/2)

your answer:

(-2,4)

Step-by-step explanation:

4 0
3 years ago
I need help ASAP!!! Please explain how to solve the problem
azamat

Answer: The equation is (x+4)^2 + (y-4)^2 = 9\\\\

Center = (-4,4)

Radius = 3

===========================================================

Explanation:

This graph shows the circle's center is at (-4, 4)

Recall in general, the center is (h,k)

So we see that (h,k) = (-4,4). More specifically: h = -4 and k = 4.

The radius of this circle is r = 3 as this is the distance from the center to any point on the edge. For example, go from (-4,4) to (-1,4).

With the h, k and r values in mind, we then say the following:

(x-h)^2 + (y-k)^2 = r^2\\\\(x-(-4))^2 + (y-4)^2 = 3^2\\\\(x+4)^2 + (y-4)^2 = 9\\\\

which represents the equation of this circle.

5 0
3 years ago
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