Car is bought for $2400, the value decreases at 15% per year. To the nearest tenth of a yr how long until the value is 10000

Given the choice between receiving $1.000.000 in one month or a single penny-doubled everyday for the period of one month; which option would you choice? show your work to support your answer. (assume that 1 month=30 days)

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?