Math problem help?

1) The distance between city A and B is 2800 mi. On a certain map, this distance is represented by 140 in. On the same map, city C and city D are 88 in. apart. What is the actual distance between city C and city D?





2) 12x^8+16x^7-16x^5+16x^3


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4x^5





3) (36m^6n-30m^5n^3+18m^4n^5) divide (6m^3n)





4) One maid can clean the house in 3 hr. Another maid can do the job in 6 hr. How long will it take them to do the job working together?

Math problem help?
2.


4x^3(3x^5+4x^4-4x^2+4)


-----------------------------------


4x^5





3x^5+4x^4-4x^2+4


= ----------------------------- (final answer)


4x^2








4. 4 1/2 hours

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