Year .. invention

1807.. steamboat
1825 ..photography
1837.. telegraph
1846.. sewing machine
1869.. hydroelectric power
1876.. telephone
1879.. light bulb
1888 ..rabies vaccine
1890 ..diesel engine
1897 ..airplane


in mr. tarkiainen’s history class, each student chooses two of the topics listed in the chart above for their papers. how many different pairs can juliana choose?

10
45
30
90

Given: klmn is a parallelogram m? n=3m? k, lf ? kn , ld ? nm kf=2 cm, fn=4 cm find: lf, ld

Which value of y will make the inequality y< -1 false?

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables