Which choice is equivalent to the expression below?
√20 + √45

→ √20 + √45

→ 2√5 + 3√5

→ (2 + 3)√5

→ 5√5

Therefore, option A is correct.

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.