Write a matrix that represents the system of equations below: 7x-3y=21 and 5x-y=85

What is the correlation coefficient for the data? don't forget to turn the diagnoisticon (in the catalog menu of the calculator). r = answer (round to the nearest thousandth)

Enter the missing numbers in the boxes to complete the table of equivalent ratios of lengths to widths. ? 18 8 ? 10 30 12 ?

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer