Sorry to ask these questions again but I just need some ideas on this one or a solution

THe body mass of a squirrel living in the will varies during a year, and is given by m=4+cos[(pi t)/6] where (m) kg is the squirrel's body mass (t) months after 1 August.

B) For what length of time will the squirrel's body mass remain above 4.7kg

pi time t in the brackets

Thanks once again

Solve the inequality:

4+cos(\frac{{\pi}t}{6})>4.7