The given expression is
[tex]d = \frac{a^3}{c b^2}[/tex]
We have to find the value of d , given the values of a,b and c are 8.9m,4.9 s , 71m/s respectively .
To find the value of d, we have to substitute the given values of a,b and c, that is
[tex]d = \frac{8.9^3}{71*4.9^2}[/tex]
[tex]d = 0.4135[/tex]