You are baking macaroons for your class. There are 9 total students in your class and you have baked 17 macaroons. Write and solve an equation to find the additional number of macaroons you need to bake in order to have 4 macaroons for each student. Write your equation so that the units on each side of the equation are macaroons per student.​

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

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?

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?