Pls answer the question

Option C:

(11 + 8) + 1 = 11 + (8 + 1)

Solution:

Let us first define the associative property of addition.

Associative property of addition:

(a + b) + c = a + (b + c)

Option A: 5 + 3 = 3 + 5

This represents a commutative property of addition.

i.e. a + b = b + a.

So, it is not true.

Option B: 6 + 1 = 6 + 1

This is not under the property of associative.

It is not true.

Option C: (11 + 8) + 1 = 11 + (8 + 1)

(a + b) + c = a + (b + c)

This reflects the associative property of addition.

It is true.

Option B is the correct answer.

Hence (11 + 8) + 1 = 11 + (8 + 1) illustrates the associative property of addition.

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you