Spearman's rank correlation

Five sites have pedestrian counts of 42, 35, 35, 28 and 50. Ranking the highest as 1, what rank does each count of 35 get?

For 10 pairs of values, what is the denominator $n^3 - n$ in Spearman's formula?

A student ranks 10 sites by two variables and finds $\sum d^2 = 28$. What is Spearman's $r_s$, to 2 decimal places?

A study of 12 beaches finds $r_s = 0.61$. The critical value at the 0.05 significance level is 0.50 and at 0.01 is 0.71. What is the right conclusion?

Distance from a river's source and mean pebble size give $r_s = -0.78$ for 15 sites (critical value 0.44 at 0.05). What does this show?