The average can be found by adding them all up and dividing that number by the number of items. If the result have you a number that's more than the largest or less than the lowest, you did it wrong.
(75+70+90+60+50+90+70)/7
= 505/7
=72.14
Answer:
(3, -3) is correct
Step-by-step explanation:
-4 × 3 = -12. -12 + 9 = -3
Answer: it is
Step-by-step explanation: the next numbers are 1.5, 3, 4.5.
Answer:
The answer is A.
Step-by-step explanation:
The common difference is five because 7-2=5, 12-7=5, 17-12=5, 22-17=5, and so on.
Answer:

Step-by-step explanation:
Poorly formatted question; The complete question requires that we prove that 
When
and
We have:

Rewrite as:

Factorize

Rewrite as:

Factor out 1 + x

Multiply both sides by 

Integrate both sides

Rewrite as:

Integrate the left-hand side

Integrate the right-hand side

implies that: 
So:
becomes

This gives:



The equation
becomes


Take tan of both sides
--- Proved