Lana is 12 years old. Her sister is y years
old. Lana is twice as old as her sister.
How old is Lana's sister?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

Ingredient c: 1/4 cup for 2/3 serving or ingredient d: 1/3 cup for 3/4 serving which unit rate is smaller

In triangle abc, angle c is a right angle. find the value of the trig function indicated. find tan a if c = 17 and a = 8