Aclassroom has triangular tables. there is enough space at each side of a table to seat on child. the tables in the class are arranged in a row (shown in the picture above)

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x