1. write three expressions that are equivalent to 3x+15.2. write three expressions that are equivalent to 2x+4x-15.

1 3(x + 5)

(9x + 45 ) / 3

2x + x + 15

2. 6x - 15

2(x + 2x) - 15

2x ( 1 + 2) - 15

the answer is 15% decrease

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.