I need help making sense of Trig values of special angles, can someone please explain what this is? Can you also give an example, for I just dont know how to solve them.

Solve 2x+y=3 x+y=5 in substitution method

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean