In circle t, ∠ptq ≅ ∠rts. circle t is shown. line segments t p, t q, t r, and t s are radii. lines are drawn from point p to point q and from point s to point r to form secants p q and s r. angles p t q and s t r are congruent. the measure of arc s r is 66 degrees. the length of t r is 3 and the length of s r is 4. what is the length of pq? 3 units 4 units 6 units 7 units

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

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3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.