There are only 9 counters in a bag. There are 2 red counters
3 green counters 4 blue counters
Lethna takes at random two counters from the bag without looking.
a) Find the probability of Lethna getting both counters of the same colour.

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

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