Which expression could be used to determine the perimeter of the triangle? A 9x + 4
B 9(x + 4)
C 13x
D 13(x + 1)

A. 9x + 4

Step-by-step explanation:

Perimeter of a triangle = side A + side B + side C

Side A = 2.5x + 3

Side B = x + 6

Side C = 5.5x - 5

Perimeter of a triangle = side A + side B + side C

= (2.5x + 3) + (x + 6) + (5.5x - 5)

= 2.5x + 3 + x + 6 + 5.5x - 5

= 2.5x + x + 5.5x + 3 + 6 - 5

= 9x + 4

Perimeter of a triangle = 9x + 4

The correct answer is A. 9x + 4

Probability that the fifth ball selected is red = 0.705

Step-by-step explanation:

Let

= Number of red balls after the 4th turn

⇒  ∈ { 0, 1, 2 }

Then,

P =

⇒

Now,

P(5th ball is red | = 2 ) = 0. +

                                         =  

                                        = 0.705

∴ we get

Probability that the fifth ball selected is red = 0.705