Why is it a good idea to estimate 1rst

The floor plan of a room has a scale of 2.5 in.: 35 ft. in the drawing, the length of the room is 8 in. and the width of the room is 6 in. what is the perimeter of the actual room?

One side of a rectangle is 7 centimeters shorter than six times the other side. find the length of the longer side if we also know that the perimeter of the rectangle is 266 centimeters.

Use the second shift theorem to find the inverse laplace transform of (e^−3s) / (s^2 + 2s − 3)