3, 6, 2, 1, 7, 5
James found the mean and standard deviation of the set of
numbers given above. If he adds 5 to each number, which
of the following will result?
The standard deviation will not change.
The standard deviation will increase by 5.
The mean will be multiplied by 5.
The mean will not change.

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

Anyone know? will mark brainliest if correct!

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.