Extract the square root of each number
2,809
400
625
169
196
1,764
5,041
961
4,356
8,100

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)