Part a: create a system of linear equations with no solution. in two or more complete sentences, explain the specific characteristics that you included in each equation to ensure that the system would not have a solution.
part b: using one of the equations that you created in part a, create a system of linear equations that has one solution (x, y). use substitution to solve the system.

13 points

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?

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)