X^2-18 = 3x
x^2 - 3x - 18 = 0
(x-6)(x+3) = 0
x = {-3,6}
So -3 is the answer
87,240. I added them both together.
Sum= addition
The total distance will be 8685.2 kilo meters if she travelled by plane
68*x/100=48
=> 68*x=4800
=> x=4800/68
=> x~=70.58
P.S: * means multiply, ~= means approximation, / means divide
Just think of any 2 number that multiply to 10, then just add really small decimal values.