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hram777 [196]
3 years ago
14

What number makes 7+n and 7-n equal

Mathematics
1 answer:
olga nikolaevna [1]3 years ago
8 0

Answer:

0

Step-by-step explanation:

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What is the formula of the sequence 3, 6, 10, 15, 21?​
AleksAgata [21]

Answer:

Tn=12n(n+1)

Step-by-step explanation:

Explanation:

These are the triangular numbers - each term in the sequence being the sum of the first n positive integers:

T1=1=1

T2=3=1+2

T3=6=1+2+3

etc.

Notice that:

2Tn=(0)+1+(0)+2+...+(n−1)+(0)+n

2Tn+(0)+n+(n−1)+...+(0)+2+(0)+1

2Tn=(n+1)+(n+1)+...+(n+1)+(n+1)

2Tn=n(n+1)

So:

Tn=12n(n+1)

3 0
2 years ago
Read 2 more answers
What is the solution for 5x^2-x+6=0
kati45 [8]

The easiest way to solve this problem is by using the Pythagorean theorem :D

Pythagorean theorem: [-b +- sqrt(b^2 - 4ac)]/2a

5 = a

-1 = b

6 = c

therefore, by plugging these values in!

[-(-1) +- sqrt((-1)^2 - 4(5)(6))]/2(5)

[1 +- sqrt(1 - 120)]/10

Oh so we're using imaginary numbers, so in this case you'll need to know that i = sqrt(-1), so keep this in mind (I can see why this was so difficult)

[1 +- sqrt(119)*i]10

answers:

( 1 + i*sqrt(119) ) / 10

( 1 - i*sqrt(119) ) / 10

7 0
2 years ago
7. If a 12 pack of soda cost Mr. Key $3.84, what would the unit price be for
AlekseyPX

Answer:

32 cents

Step-by-step explanation:

3.84 ÷ 12 = 0.32 so 32 cents

7 0
3 years ago
Rewrite the equation of the circle (x-2)^2+y^2=3 in general form
Oksi-84 [34.3K]

Step-by-step explanation:

x²+4-4x+y²=3

x²+y²-4x+1=0

4 0
3 years ago
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NOT GRADED. <br>FIND THE MEASURE OF THE INDICATED ANGLE IN EACH TRIANGLE.​
Setler [38]

Answer:

The angle in the box is always 50 and that other acute angle is 46

Hope this helps

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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