F$-38$ A mixed soil was tested three times in a triaxial test under varying confining pressures. From the results obtained below;

$($a$)$ What is the value of cohesion of the soil?

$($b$)$ What is the friction angle of the soil?

$($c$)$ If the confining stress on the soil in$-$situ is $3\mathrm{.}62\frac{N}{c}{m}^2,$ how much additional vertical stress $($deviator stress$)$ could be applied before failure occurred?

$($d$)$ What would be the shearing stress at failure as per $($c$)$

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