2019-2020 8th Grade Math 1st Semester Review

Front

What is a function in mathematics?

Back

A function is a relation in which each input has exactly one output.

Front

How do you calculate the monthly savings needed to cover a total bill?

Back

Subtract any contributions (like scholarships or parental support) from the total bill, then divide the remaining amount by the number of months.

Front

What is simple interest and how is it calculated?

Back

Simple interest is calculated using the formula: Interest = Principal x Rate x Time.

Front

What does a positive, non-linear trend in a scatterplot indicate?

Back

It indicates that as one variable increases, the other variable also increases, but not at a constant rate.

Front

How can you determine if a relationship is proportional using a graph?

Back

Look for a straight line that passes through the origin; this indicates a proportional relationship.

Front

What is the formula for calculating the total amount in a savings account with simple interest?

Back

Total Amount = Principal + (Principal x Rate x Time).

Front

What is the significance of the slope in a linear function?

Back

The slope indicates the rate of change between the two variables in the function.

Front

What is the difference between a linear and a non-linear function?

Back

A linear function has a constant rate of change and graphs as a straight line, while a non-linear function does not have a constant rate of change and can curve.

Front

What does it mean for a function to be one-to-one?

Back

A one-to-one function means that each output is paired with exactly one input, ensuring no two inputs produce the same output.

Front

How do you interpret the y-intercept in a linear equation?

Back

The y-intercept is the value of y when x is zero; it represents the starting point of the function on the y-axis.