For the following questions answer them individually
If '+' means '÷', '-' means 'x', 'x' means '-' and '÷' means '+', then (5 - 8 x 6 ÷ 11) + 9 = ?
Simplify: $$ cos 5^\circ + cos 24^\circ + cos 175^\circ + cos 204^\circ + cos 300^\circ $$
What happens to the force of gravitation between two objects when the mass of one object is doubled?