Marc-Antoine Ouimet

I think Khan Academy's exercices accept fractions as an answer. That may be why it does not recognize the infinite decimal. Here are two example on how to convert repeating decimals to fraction:

1. Comunidad
2. Study Group
3. entering repeating decimals answers

We consider the quantities S (for Saima) and B (her brother). We know that the ratio of S/B=50%=1/2. The ratio B/S then equals to 2/1, or 200%. Mathematically, we're considering the inverse of the ...

1. Comunidad
2. Study Group
3. Percentage Word Problem

The exponent only applies for the term it is attached to. You would need parentheses to include the minus sign.

1. Comunidad
2. Study Group
3. help with multiplying a negative and variable with an exponent

1. Comunidad
2. Study Group
3. HELPPPPP

That limit is the definition of a derivative. Here's an example with f(x)=4x^2:

1. Comunidad
2. Study Group
3. calculus problem for daughter

Personnally, I've learned hyperbolas that way: When the 1 is positive, the hyperbola is horizontal, and when it's negative, it's vertical. If we consider a vertical hyperbola, we can rewrite its eq...

1. Comunidad
2. Study Group
3. Hyperbola something wrong for me