I'm pretty sure they all divide by 1/2 at some point.
First, fint the roots of the equation
1.

2. You can see that this equation has two different real roots. Note that you can make this statement without finding roots, only knowing the value of discriminant: since D=81>0, then the equation has two different real roots.
Overestimate because 4 3/10 x 7 = 30 1/10 miles
18 !
27/x = 12/8
Cross multiply and then solve
Milli(m) = 1/10^3 = 0.001
kilo(k) = 10^3 = 1000
8.41 * g/ml
= 8.41 g/mL / 1000 mL
= 0.00841 g/L
g = 10^3 * (1/10^3) * g
= (1/10^3) * kg
0.00841 g/L / 1000 g
= 0.00000841 kg/L