Of all rectangles with area 9 which one has the minimum perimeter

Jackson drew 4 hearts and 29 circles. what is the ratio of circles to all shapes?

Add or subtract polynomial : –12qr? +13rq?

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.