Estimate the sum of 283 and 637 to the nearest hundred

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?