Write 2350 million in standard form

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?