What is the negative sqare root of 9/4

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c,with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?