20 points!
I just need help with these!
I will give brainliest as well.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.

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