The width of a rectangle is 2cm less than its length. the perimeter of the rectangle is 16 cm.
what is the length of the rectangle?

Step-by-step explanation:

Let the  Length of the rectangle  = x

Width = x - 2

Perimeter = 16 cm

2 * ( length + width) = 16

2 * ( x + x-2 ) = 16

2 * (2x - 2) = 16

2x - 2 = 16 /2

2x - 2 = 8

2x  = 8+2

2x= 10

x = 10/2

x = 5

Length of the rectangle = 5 cm

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64