Hi there, please help:)

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

What is negative 3/9 times negative 2/8 ?

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe