D2y-4Dy-21y=0; Dy=0 and y=2 when x=0

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Gables properties corp. is leasing office building with an area of 49b^2+70b+25. what is the shape of the building? a) rectangle b) square

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