What real value of $t$ produces the smallest value of the quadratic $t^2 -9t - 36$?

The test scores of 32 students are listed below. construct a boxplot for the data set and include the values of the 5-number summary. 32 37 41 44 46 48 53 55 57 57 59 63 65 66 68 69 70 71 74 74 75 77 78 79 81 82 83 86 89 92 95 99

Im so bad at fractions they are not my best math thing to work on

Point a (7,3) is translated to a'(16,-9). which rule describes the translation?