Find Frictional force on a block

[trivk96]

Homework Statement

A block of mass 9 kg rests on a plane inclined
at an angle of 30◦
. The static coefficient of
friction between the block and the plane is
0.7.
What is the frictional force on the block?
1. 9.36841 N
2. 76.3834 N
3. 53.4684 N
4. 44.1 N
5. 30.87

It is not # 3. I know that for sure.

Homework Equations

F=ma
F_f=μ*F_n

The Attempt at a Solution

I have no idea

 

[VACA]

Have you tried drawing a free body diagram?