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Question 1

x ∝ z means that

Answer 1

directly proportional to” or “directly proportional

This means that as x increases, y increases at the same rate.

Question 2

A Diagram shows bars with no gaps between them

What is this type of diagram called?

Answer 2

A histogram

The curved line shows the trend over all of the bars. Remember, a bar chart would have gaps between the bars.

Question 3

y ~ x means

Answer 3

that y is approximately equal to x

The curvy line ~ means “is approximately equal to”