Discover Questions

Does NASA still use miles instead of kilometers? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? How many molecules are in 97.8g of FeCl3? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20?