The difference of two binomials is a binomial

 A2 - B2 = (A - B)(A + B)

Step-by-step explanation:

How to find the product of sum and difference of two binomials with the same terms and opposite signs, so Its stated as: The product of the binomial sum and difference is equal to the square of the first term minus the square of the second term.

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.

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls