The length of a rectangular envelope is 3 1/2 times its width. A plastic band surrounds the front and back of the envelope to secure it as shown in the picture. The plastic band is 40 3/8 inches long, find the length and width of the envelope.

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