Thursday

October 2, 2014

October 2, 2014

Posted by **Shawna** on Friday, March 21, 2014 at 11:33am.

4−(4/n)+(5/n)+(15/3n^2)

A) 20

B) 10

C) 5

D) 4

E) 1

- Math - PreCalc (12th Grade) -
**Reiny**, Friday, March 21, 2014 at 11:46amUse you "sense" of numbers to see what happens to the fractions as n gets larger.

(I think your last term should read 15/(3n^2) or else it becomes large as n gets large)

e.g. look at 5/n

suppose n = 100,000, then 5/n = .00005 , which is close to zero

suppose n = 1,000,000,000 , then 5/n = .000000005, even closer to zero

so as n gets really big

4/n and 5/n each ---> 0

and 15/(3n^2) ---> even faster

so you are stuck with

4 - 0 + 0 + 0 = 4

**Answer this Question**

**Related Questions**

Math - PreCalc (12th Grade) - If Sn = 1 + 6 + 11 + 16 + 21 + 26...... where an...

Math - PreCalc (12th Grade) - What is the left-hand limit of f(x)=|x−3|/x...

Math - PreCalc (12th Grade) - What value must be defined for f(4) to remove the ...

calculus - What is the value of this expression when n approaches infinity? 4 &#...

Math - PreCalc (12th Grade) - What is the right-hand limit of this function at x...

Math - PreCalc (12th Grade) - What is the first natural number that causes the ...

Math - PreCalc (12th Grade) - The function f(x) = x2 − 5 is defined over ...

Math - PreCalc (12th Grade) - If Sn represents the sum of the squares of the ...

Math - PreCalc (12th Grade) - Which rectangular equation corresponds to these ...

Math - PreCalc (12th Grade) - What does this function show at x = 5? f(x)=x^2&#...