# Posts by Yenny

Total # Posts: 9

**statistics**

Suppose that the certain lifetimes of a certain light bulb are normally distributed with μ=1500 hours and σ=200. Find the probability that a light bulb will burn out in less than 1200 hours.

*May 14, 2012*

**math**

a money market fund pays 14% annual interest compunded daily. What is the value of $10,000 invested in this fund after 15 yrs?

*April 17, 2011*

**mat**

Sara invested money at a bank that paid 3.5% annual interest compounded quarterly. If she had $4650 at the end of 4 yr what was her initial investment?

*April 17, 2011*

**math**

An amount of $3000 was deposited in a bank at a rate of 2% annual interest compounded quarterly for 3yrs. The rate then increased to 3% annual interest and ws compounded quarterly for the next 3 yrs. If no money was withdrawn what was the balance at the end of this time?

*April 17, 2011*

**Math 123**

carolyn borowed $125 if the interest rate is 1.5% per month on the unpaid balance and she does not pay this debt for 1yr how much interest will she owe at the end of the year

*April 16, 2011*

**Math 123**

if her earnings were increased to 7% for a sum of 27,285 how do I get 107% from 7%?

*April 16, 2011*

**Math 123**

Can you tell me how you got the 1.07X

*April 16, 2011*

**Math 123**

Gail received a 7% raise last year. If her salery is now $27,285 what was her salery last year?

*April 16, 2011*

**physics**

i was researching other teachers' answers and they had this for high resolution in optical instruments, the angle between resolved objects should be a. as small as possible

*March 11, 2009*

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