Can someone me asap , i've beens stuck for the longest.

what is the length of stack bc with bar on top ? round to the nearest tenth of a unit.

a.
3.5 units

b.
4.9 units

c.
8.6 units

d.
15.0 units

If the class was going to get a class pet and 5 picked fish and 7 pick bird and 8 picked rabbits have many students were in the

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?