1) The sum of the square of a positive number and the square of

5 more than the number is277. What is the number?

2)Benjamin threw a rock straight up from a cliff that was

84 ft above the water. If the height of the rock h, in feet, after t seconds is given by the equationnbsp h equals negative 16 t squared plus 100 t plus 84

h=16t2+100t+84, how long will it take for the rock to hit the water?

3) The length of a rectangle is

3 centimeters less thantwice its width.Its area is20 square centimeters.Find the dimensions of the rectangle.