How is a constant of proportionality like a unit rate?

I need to find the tax rate as a percent if the total was $295 and the tax was $7.50

9x + 6y = -30 how can you make them terms of y

Marie is making a recipe that calls for 1 cups of oil. How many fluid ounces of oil should she use?

Jane is baking cookies for a large party. She has a recipe that will make one batch of two dozen cookies, and she decides to make five batches. To make five batches, she finds that she will need 12.5 cups of flour and 15 eggs.

A ball is thrown from a height of 182 feet with an initial downward velocity of 12/fts. The ball's height h (in feet) after t seconds is given by the following.

4 cents per day = ? dollars per year

Whats the mixed number for 2.27

How many thirds are there in 5?

Tickets for a school play cost $7 for students and $10 for adults. The equation 7x+10y=80 represents the number of students x and adults y who can attend the play for $80. if no students attend, how many adults can see the play for $80

Evaluate the expression 3.6 - 3.6 divided by 4.5