11. The table shows the distribution of the number of hours per day spent in studying by 50 students. Number of hours per day 4 5 6 7 8 9 10 11 Number of students 5 7 5 9 12 4. 3 5 Calculate, correct to two decimal places, the: (a) mean; (6) standard deviation.​

Adriveway is 60-feet long by 6-feet wide. the length and width of the driveway will each be increased by the same number of feet. the following expression represents the perimeter of the larger driveway: (x + 60) + (x + 6) + (x + 60) + (x + 6) which expression is equivalent to the expression for the perimeter of the larger driveway? a) 2(x + 66) b) 4x + 33 c) 4(x + 33) d) 4(x + 132)

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

How can you construct perpendicular lines and prove theorems about perpendicular lines