The surface area of each face of a cube is (x 2 + 6x + 9) m2

Find an expression for the,
i. length of each edge

length of each edge = (x + 3)

Step-by-step explanation:

The surface area of each face of the cube = ( + 6x + 9) . But the surface of a cube has the shape of a square. So that,

Area of a square = length x length

                            =

By factorizing the area,

+ 6x + 9 = + 3x + 3x + 9

                  = ( + 3x) (3x + 9)

                  = x(x +3) + 3(x + 3)

                  = (x + 3)(x + 3)

                  =

+ 6x + 9 =

Thus,

=

find the square root of both sides

l = (x + 3)

length of each edge = (x + 3)

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.