Under what condition the composite function of any two function is an identity function?

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 !

Let f of x equals the integral from 1 to 3 times x of the natural logarithm of t squared. use your calculator to find f″(1).

What is the approximate value of the correlation coefficient for the given graph? a. 1 b. 5 c. 3 d. -1