Which statements correctly describe the fraction bar diagram shown at left? Check all that apply. The unshaded portion of the fraction bar represents a unit fraction.

Each part of the whole fraction bar is equal to one-seventh.

The shaded portion of the fraction bar represents a unit fraction.

The shaded portion of the fraction bar represents 7/1 .

Each part represents a unit fraction.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).