1 A rectangle has a length of (x + 3) centimeters and a width of \frac{1}{2} 2 1 ​ x centimeters. If the perimeter is 24 centimeters, what is the length of the rectangle?

9cm

Step-by-step explanation:

Perimeter of a rectangle = 2(L+W)

L is the length = x+3 cm

W is the width = 1/2 x cm

Perimeter = 24cm

Substitute into the equation;

P = 2(x+3+ 1/2 x)

P = 2(3/2x + 3)

24 =  2(3x/2 + 3)

Expand

24 = 3x + 6

3x = 24 - 6

3x = 18

x = 18/3

x = 6

Since L = x+3

L = 6+3

L = 9cm

Hence the length of the rectangle is 9cm

no, because the sides are not congruent

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.