Friction on Inclines

“A 2 kg block rests on an inclined plane angled at 20°. The coefficient of static friction between the block and the plane is 0.3. Will the block slide down the plane? Show your calculations and explain your reasoning. A box is placed on an inclined ramp with an adjustable angle. The coefficient of static friction between the box and the ramp is 0.45. At what angle will the box begin to slide down the ramp? Show your calculations.”