What's standard form of( 4 ten thousand 8 hundred)÷10

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.