For the data set 7,5, 10, 11, 12, the mean, x, is 9. What is the standard
deviation?
The formula for the sample standard deviation is s
h (x-7).
Use the table to help you.
(x - 2)?
-
24
-
4
16
1011
12 4
12 39
Sum = 34
Round your answer to the nearest tenth.

You can model the population of a certain city between 1955-2000 by the radical function p(x)=55,000 sqrt x-1945. using this model, in which year was the population of that city 220,000

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.