Posted by John on .
R=square root of u squared plus v squared divided by m and u and v are positive.Find u when r=3,v=6 and m=5

Maths 
PsyDAG,
Assuming there are no parentheses:
r = √u^2 + v^2/m
3 = √u^2 + 36/5
√u^2 = u = 7.2  3 = 4.2