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prove that cosA/1-sinA=2cosecA

if y =0.05x + 4.95 per month and x is the number of minutes. If you talk 140 minutes what is the monthly cost.

if shelia invested $5000 in an account paying 3% annual interest. how many years will it take her money to double? write it in exponential equation and rewrite it in log form. please help

in 1998 rachel opened an account paying 4% annual interest. Has her money doubled yet? if so when did it and if not when will it.

in 2000, Sam opened an account paying 5.2% annual interest. Has his money doubled yet? if so, when did it. If not when will it? I believe this is simple interest, for it is not stated.

thank you.

teachers answer is 2.58 years, can't figure this one out.

it does not say, i would think simple

.89

meo