Music may people relax. john got two groups of people together. he took everybody's pulse of blood pressure. the one group to listen to soothing music while other group sat in silence. after the song was over, he measured everyone's pulse and blood pressure. what is the independent variable? what is the dependent variable? what are the constants or control variables?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

20 points + brainliest answer + my mom’s chocolate chip cookie ! subtract.

Arrange the steps to solve this system of linear equations in the correct sequence. x + y = -2 2x – 3y = -9 tiles subtract 3x + 3y = -6 (obtained in step 1) from 2x – 3y = -9 (given) to solve for x. substitute the value of x in the first equation (x + y = -2) to get y = 1. the solution for the system of equations is (-3, 1). x = -15 the solution for the system of equations is (-15, 13). add 3x + 3y = -6 (obtained in step 1) to 2x – 3y = -9 (given), and solve for x. x = -3 substitute the value of x in the first equation (x + y = -2) to get y = 13. multiply the first equation by 3: 3(x + y) = 3(-2) 3x + 3y = -6.