Remember that algebraically the logarithm is an exponent. More precisely, if b> 0 and b 1, then for positive values of x the logarithm in base b of x is denoted by and is defined as that exponent to which b must be raised to produce x. For example, Historically, the first logarithms to study were base 10 called common logarithms.

Have you ever seen a 100 trillion dollar bill? If you think it doesn't exist, just look at the photo below. These dollars come from the Republic of Zimbabwe, an African country. But don't think you would get rich if you had such a note. On the contrary, maybe he couldn't even buy a bottle of water.

Age Ratio Difficulty Level: The ages of two people 8 years ago were 8 to 11; they are now in the ratio of 4 to 5. What is the age of the oldest today? Challenge 2 Combinatorial Analysis Challenge Index Next >> Challenge 4 How Many Triangles?