Simplify the expression. Write the answer using scientific notation. (9x 10^7)(7x10^9)

Let w=23 . what is the value of w + 45 ?

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

What expression is equivalent to (2x-1)(x-3)?