How to work out the shaded area of a circle with a 2.3cm centre and a 6.5cm radius

A3x4x5 rectangular cuboid (e.g. a brick) is painted blue and cut into 1x1 cubes. what is the expected value for the painted sides of a randomly selected cube?

Find the nonpermissible replacement for binthis expression.b2/5b +5

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is