A salad dressing recipe calls for 3/4 cup of olive oil for every 1/2 cup of vinegar. How many cups of vinegar are needed for two cups of olive oil?

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is