Evan washes two types of vehicles. it takes him 30 minutes to wash a car and 40 minutes to wash a truck. he charges $12 to wash a car and $15 to wash a truck. in 270 minutes, evan made $105 washing cars and trucks. how many trucks did evan wash? 2 trucks 3 trucks 4 trucks 5 trucks

Apple pie is removed from 350 degree oven. temperature of the pie t minutes after being removed id given by the function t(t)=72+268e-0.068t

What are the sotions to the quadratic equation 9x^2=4

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?