Sam borrows money from his brother to buy a new video game. he agrees to pay his brother back the full amount of the loan, plus an additional $4.50, which is 9% interest. how much did sam borrow originally?

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.