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∆abc has a(-3, 6), b(2, 1), and c(9, 5) as its vertices. the length of side ab is
a) (50)^1/2
b) (65)^1/2
c) (105)^1/2
d) (145)^1/2
units. the length of side bc is
a) (50)^1/2
b) (65)^1/2
c) (105)^1/2
d) (145)^1/2
units. the length of side ac is
a) (50)^1/2
b) (65)^1/2
c) (105)^1/2
d) (145)^1/2
units.
∠abc ≈ °
a) 55.21
b) 85.16
c) 105.26
d) 114.11

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