Please help this is due in 12 mins !!!?!?

Is the square root of 4 plus the square root of 16 rational?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in