Find the value of each expression.

For each equation, write two more equations using the same numbers that express the same relationship in a different way.

A shopper bought a watermelon, a pack of napkins, and some paper plates. In his state, there is no tax on food. The tax rate on non-food items is 5%. The total for the three items he bought was $8.25 before tax, and he paid $0.19 in tax. How much did the watermelon cost?

Which graphs could not represent a proportional relationship? Explain how you decided.

The xy coordinate plane with the origin labeled “O”. For each graph, the x axis has the numbers 0, 5, and 10 indicated. The y axis has the numbers 0 and 5. In graph A, the curve is a line that begins at the origin and moves steadily upward and to the right.

The xy coordinate plane with the origin labeled “O”. For each graph, the x axis has the numbers 0, 5, and 10 indicated. The y axis has the numbers 0 and 5. In graph B, the curve begins at the origin and moves upward and to the right. It moves slowly in the beginning and then goes steeply upward.

The xy coordinate plane with the origin labeled “O”. For each graph, the x axis has the numbers 0, 5, and 10 indicated. The y axis has the numbers 0 and 5. In graph C, the curve is a line that begins at the origin and moves slowly upward and to the right.

The xy coordinate plane with the origin labeled “O”. In graph D, the curve is a line that begins on the vertical axis and above the origin. It moves slowly upward and to the right.