Retaining Wall Design

A concrete block retaining wall with blocks of equal height is being installed to support a cut slope so that a road can be widened.

a$)$ Calculate the factor of safety for overturning and sliding. Assume that ${}_{\text{c}\text{o}\text{n}\text{c}}=24k\frac{N}{m^3},{}_w=10k\frac{N}{m^3},$ and the wall interface friction angle is $\frac{2}{3}{}^{\text{'}}.$

b$)$ If the factors of safety are $2\mathrm{.}0$ for overturning and $1\mathrm{.}5$ for sliding under static conditions, does the wall meet these design requirements?

Note: all measurements are in metres and ${}_{\text{s}\text{a}\text{t}}=$