Find the number of ways of arranging the numbers 1, 2, 3, . . . , 9 in a 3 × 3 grid, so that the sum of the numbers in each row is odd.

Identify the graph of y = ln x + 1.

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)