ElectricPavlov

A VERY long time!

2.9 x 10^5 words  /  40 words/min   =  7250 minutes = 120 . 833 hours =  5.035 days

To use the Quadratic Formula.....From your PREVIOUS question, the quadratic equation MUST be in the form:

ax^2 + bx + c = 0

Your previous question was    8x^2 +3x - 11 = 691         which is NOT the correct form it has to equal 0

get it into proper form by subtracting 691 from each side

8x^2 + 3x - 702 =0

NOW  a = 8  b = 3  and c = -702   (NEGATIVE 702)

   a = 8   b = 3  and c = -702

x =  (-3 +- sqrt(9 - 4(8)(-702) )   )    /   2(8)

Need more help??

If so, please respond to THIS question....do not post another Forum entry.

Let 'x' = sister's age...

then Kim's age = 2x

added together they equal 36     so:   x + 2x = 36     solve for 'x'

3x=36   (divide both sides by 3)

x=sister's age = 12    Kim's age = 2x = 24 

Using Quadratic Formula    x = 9.1818     or   - 9.556

Quadratic Formula:

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

Sorry, but the way this qustion is written, makes it very unclear as to how to solve it.

   ' 88% of books are classified by nonfiction or fiction.'    ..Are you sure you transcribed this part correctly?  Is there more info you have not given?

25 - 28  =  -3

1/5  is 'One FIfth'  =  1 divided by 5  =  .2

Pythagorean Theorem ONLY applies to RIGHT triangles. 

In an EQUALATERAL triangle you will have to draw a perpindicular  line from the MIDPOINT (that is a HINT) of the base to the apex to break it up in to TWO right triangles to calculate side lengths....

The calculator on this website will do this for you....look ABOVE the normal display and enter 144 / 15

48 / 5     9.6     or   9  3/5

The GCF of 30 and 42  is   6