The sum of two rational numbers is 9 and one of them is − 3, then the other is_.( ) 10

12

Step-by-step explanation:

let the rational number be x

x+(-3) = 9

x = 9+3 = 12

12

Step-by-step explanation:

x + y = 9

x = -3

=>

-3 + y = 9

y = 12

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.

i believe the answer is letter c) 8

step-by-step explanation: