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Answers are: choice C, choice D

Explanation:

Let

a = adult admission fee

c = child admission fee

Focus on row 1 for now

45a = cost of having 45 adults total

30c = cost of having 30 children total

45a+30c = total cost of 45 adults and 30 children = 315

So, 45a+30c = 315 is the first equation

Now move to row 2

For similar reasoning, 50a+40c = 370 is the other equation

50a = cost of having 50 adults buy a ticket

40c = cost of having 40 children buy a ticket

50a+40c = total cost of having 50 adults and 40 children = 370

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d

step-by-step explanation:

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.