Can someone show me the steps to working this problem out because i got a test on this next week? for the in advance.

a light bulb producing company states that its lights will last an average of 1200 hours with a standard deviation of 200 hours. a sample of 100 light bulbs from the company were tested and the researcher found that the average life of each light bulb was 1050 hours. at a 95% confidence level, determine whether these light bulbs are in compliance with the company's claim.

Colin listed his assets and liabilities on a personal balance sheet. colin’s balance sheet (august 2013) assets liabilities cash $1,500 credit card $500 stocks $800 rent $800 car $5,000 car loan $1,200 coin collection $1,200 student loan $5,000 total total which statement is true about the total assets and the total liabilities? the total of the assets and the liabilities are the same. the total of the assets is greater than the total of the liabilities. the total of the assets is less than the total of the liabilities. the total of the assets cannot be compared to the total of the liabilities.

Bobs burgers bam has a special deal of 4 hamburgers for $6. at that rate, how much should it cost to buy 3 hamburgers?

How can i differentiate this equation?