3. The distance to Pluto is approximately 5,900,000,000 km. A firefly is about 0.04 cm. long. (a) What is the distance to Pluto written in scientific notation?
(b) What is the length of a firefly written in scientific notation?
(c) How many fireflies would it take to reach Pluto if they were put end to end? Write your answer in scientific notation and round to the nearest tenth (Hint: Check the units before you complete the operation)

Abus ride for a senior citizen cost $1.25. a monthly pass costs $35. write and inequality that represents the number of times a senior citizen must ride the bus for the monthly pass to be a better deal.

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. another supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which would you choose and how much would you save with that choice? show calculator try it! if you buy 1000 ml bags, how many do you need to buy each month? type your answer in the space provided and click on the check answer button.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15