Lets x = Mary's age

Emily is there years older than twice her sister Mary's age = 2x + 3

Sum of both is less than 30:

x + 2x + 3 < 30

Solve for x

3x + 3 < 30

3x < 27

x < 9

Mary's age = 9

Inequality represents Mary's possible age:

0 < x < 9

Answer is the second one

0 < x < 9

**Answer:**

you are basically given an unknown and you try to solve for it. if you need any guidance feel free to ask.

**Answer:**

Top left.

**Step-by-step explanation:**

Because it is a function which forms a straight line in a graph

Refer the attached image for the answer

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