i think i dont know that 0 + 0 + 0 is 

no xD

p.s dont ask childish questions this is a page for solving  math equations not how small you have it.

19

e = 2.7182818284590452

Solve for x:
x^2+4 x+21 = 0

Subtract 21 from both sides:
x^2+4 x = -21

Add 4 to both sides:
x^2+4 x+4 = -17

Write the left hand side as a square:
(x+2)^2 = -17

Take the square root of both sides:
x+2 = i sqrt(17) or x+2 = -i sqrt(17)

Subtract 2 from both sides:
x = i sqrt(17)-2 or x+2 = -i sqrt(17)

Subtract 2 from both sides:
Answer: |  x = i sqrt(17)-2       or         x = -i sqrt(17)-2

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

well, you need to divide them you could use a calculater.

Its 5/6

803.84

Because..well..idk! GOOGLE IT

n = 12

1/2(12^2 - 3(12))

(144-36)/2

108/2

54

54 diagonals on a 12 sided polygon.

That's just a typo    I typed an extra zero   the question asks for   cubrt(64/343)  = 4/7

sqrt3(64/3430) = 0.2652336476350159

NOT 4/7. 

It would take less effort to use the calculator on this website than to type in such questions!

Permutation: A set of objects in which position (or order) is
important=nPr=68P5=1,250,895,360
Combination: A set of objects in which position (or order) is NOT
important.=nCr=68C5=10,424,128

To find the AVERAGE   add all of the scores and divide by the NUMBER OF SCORES

(16 + 20+ 12+ 10+  18 +14 )/ 6          I'll let you take it from here......

3/4 equals 0.75, so 2 3/4 will equal 2+0.75=2.75

2 3/4  is equal to  2 +   3/4    is equal to   2+  3 divided by 4 =

2 +  3 divided by 4 = 2 +  .75 = 2.75

Plants incorporate carbon as long they live. Once a plant dies, it takes how many years for 99.9% of the carbon-14 to decay (half-life of C-14 is 5730 years)?

.001=2^-t

0.001 = 2^(-t)

0.001 = 1/1000:
1/1000 = 2^(-t)

1/1000 = 2^(-t) is equivalent to 2^(-t) = 1/1000:
2^(-t) = 1/1000

Take reciporicals of both sides:
2^t = 1000

Take the logarithm base 2 of both sides:
Answer: |  t = (log(1000))/(log(2))=9.965 halve lives, or 9.965 x 5,730=57,099.45 years

We are looking for the time when .1% of the original is left ..... or .001 x original

1/2^n  = .001   Log both side

Log(1/2^n)  = Log(.001)

n Log1/2      =  -3

n = number of half lives = -3/(log(1/2) = 9.965784284 half lives

9.965784284 (5730) = 57103.94394732 years

cuberoot(64/3430) = 4/7

1*25

25*1

-1*-25

-25*-1

5*5

-5*-5

Individual factors:

1

5

25

-1

-5

-25

You don't need to find an integrating factor here; the left-hand side is already in a form which you can write directly as:

\(\frac{dy(x^2+1)}{dx}\)  so your ode becomes  \(\frac{dy(x^2+1)}{dx} = x^2-1\)

Now integrate both sides wrt x and proceed as normal.

Sounds like they are going bi BICYCLE if they need THAT MANY calories per day!   How many people are going???