Subtract using a number line,
-3-(-7)
Select the point on the number line to plot the answer

−3−(−7) = 4

Step-by-step explanation:

The given expression is

We know that (-)(-)=(+). So, the given expression can be written as

-3+7

4

We need to find the value of the given expression using a number line.

Two numbers are -3 and -7.

Plot these two numbers on the number line.

Now, start form -7 and jump up to -3 on the number line and count the jumps, then the number of jumps is the answer.

From the below figure it is clear that the number of jumps between -7 and -3 is 4.

Therefore, the value of the given expression is 4.

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.