For a linear regression, what is the r-value of the following data to three decimal places?
х
у
1
4
2
6 9
11
10
16
12
14
A. 0.665
B. -0.816
C. 0.816
D. -0.665

Solve 2x+y=3 x+y=5 in substitution method

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !