49 points what is the first step to solve this system of equations? 4x-3y=-10 2x+3y=4

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

With this question substitute t=3 and t=5 to determine if the two expressions are equivalent. 4(t + 3) 4t+12 which statements are true? check all that apply. a. the value of both expressions when t =5 is 32. b. the two expressions are not equivalent. c. the value of both expressions when t=3 is 15. d. the value of both expressions when t=5 is 23. e. the two expressions are equivalent. f. the value of both expressions when t=3 is 24.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?