Question If 7 shirts and 7 sweaters cost $308, and 8 shirts and 4 sweaters cost $276, what is the cost of one shirt and what is the
cost of one sweater?

Can someone me with this problem . show your work .

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

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?