1. The number of new flu cases in a major city decreased from 3,450 to 2,811 within one week. What is the percentage decrease? {Include the % sign.} 2. 0.52 milliseconds equal 3....

just a math assignment that I really need help on because I don't understand all the questions are on the Word document that I attached and I would just need you to answer them in that work spreadsheet or whatever way is easier for you. I really hope you can help this is a huge part of my grade in the class.


1. The number of new flu cases in a major city decreased from 3,450 to 2,811 within one week. What is the percentage decrease?   {Include the % sign.} 2. 0.52 milliseconds equal 3. The number 2.4×107 equals 4. Express 0.000007200 in scientific notation. 5. The mean concentration of lead found in trout in a river in Oregon is about 0.9 mg per kilogram of trout. Express this concentration in ppb (parts per billion). 6. 70,000 cm equals 7. 810 mg equals 8. 10 cm2 equals 9. 0.01 m2 equals 10. A stock solution contains 25 mg/mL of imaginal. We add 10 mL of the stock to 190 mL of water (the total volume of the mixture equals 200mL). What is the concentration of imaginal in the mixture?  11. You dilute 5 mL of a fantasium stock solution with 70 mL of water (the mixture has volume 75mL). The concentration of the mixture is 8 g/mL, what is the concentration of the stock solution? 12. What is the dilution factor when four 1:5 serial dilutions are performed? 13. In an effort to estimate the bird population on an island you capture and mark 70 birds and release them again. Three days later you find that 16 of 80 captured birds are tagged. What is your population estimate? 14. In a small park in Ohio, 28 gray squirrels were captured, marked, and released back into the population. The next day, 13 squirrels were captured, of which 7 were marked. Estimate the size of the gray squirrel population. 15. If the sex ratio females:males in a population is 5:3, then males make up 16. The quantity log 4x equals 17. If 5x= 16 then x =  18. If 5x= 16 then x =  19. A soft drink has hydrogen concentration [H+] = 8×10−3M. Its pH is 20. The pH of a substance is 4.2, what is its hydrogen concentration? Put your answer in the format 1.2*10^-3M filling in the appropriate numbers 21. Suppose that 20% of the students on campus are smokers. What is the probability that a randomly selected group of six students consists of two smokers and four non-smokers? 22. A genetic experiment is known to have a success rate of just 12%. You repeat the experiment ten times. (a) What is the probability that the experiment fails every time? (b) What is the probability that you succeed at least once? (c) What is the probability that it is successful exactly one time? Please put your answer in the format 12.34% 23. A family has four children. (a) What is the probability that the first child is a girl? (b) What is the probability that the first and the last child are girls? (Nothing is said about the middle children here.) (c) What is the probability that they are all girls? Fraction format m/n