Twenty five books of the same kind are divided into 6 groups. Each group has at least one book and each group has a different number of books. How many ways are there to divide the books ?

Which statement is true 1.the pythagorean theorem can be used to find the missing side of any triangle 2.the pythagorean theorem can be used to find the missing side of any polygon 3. the pythagorean theorem can be used to find the missing side of any right triangle 4.the pythagorean theorem can be used to find the missing side of any isosceles triangle

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

We just started the introduction into circles and i have no idea how to do this.