A university wants to investigate how much its students spend on textbooks each semester. Since all students must purchase their materials through the campus bookstore, a random sample of student accounts may be selected, and the average dollar amount spent on textbooks at the campus bookstore for those students may be calculated. Which plan will produce the narrowest confidence interval for the true mean dollar amount spent on textbooks

What are “like terms”? why can we only add like terms?

Dots sells a total of 279 t-shirts ($2) and shorts ($4). in april total sales were $670. how many t-shirts and shorts did dots sell?

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?