There are b black marbles. This is four more than twice the number of red marbles. How many red marbles are there?

Guys i really need or i have to stay late up night

With alll of except for the 2 that i did already

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 . reset next