Is 10 thousands, 5 hundreds greater than or less than 1,050 tens

Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?

An object is accelerating at a constant rate. its velocity in feet per second as a function of time in seconds can be modeled by the linear function v(t) = 2.5t. what does the dependent variable represent for this function? a) acceleration b) distance c) slope d) velocity