Question 12 the length of a rectangle is three times its width. if the perimeter of the rectangle is 40 m , find its area.

The area of the rectangle is 75 squared meters.

Step-by-step explanation:

Width of the rectangle = w

Length of the rectangle = l = 3w

Perimeter of the rectangle = P = 40 m

Perimeter of the rectangle = 2(l+w)

The area of the rectangle ,A= l × w

The area of the rectangle is 75 squared meters.

19.

step-by-step explanation:

you add the 9 in the tens column since it is a single digit and 9 plus zero is 9 so it is 19

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong