Please help me out with solving these problems.

2l^2 + 2m^2 + 2n^2 + 2nl + 2lm + 2mn

Second one's answer ^

Not sure about that first one..

over the argument its not good to fight.

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.