Answer: the answer is 13
Step-by-step explanation:
Mean means to find the average so add them all and divide by 4.
Answer:
2700
Step-by-step explanation:
9x20x15= 2700

Note that both the numerator and denominator approach 0 as

, so we can try using L'Hopital's rule.

The denominator is nonzero at

, so the limit is equivalent to
( - 8 + b )( - 4 - 3 ) = 0;
( - 8 + b )( - 7 ) = 0 ;
-8 + b = 0;
b = 8.