Suppose $\triangle DEF$ is isosceles and $\overline{DE}$ is twice the length of $\overline{EF}.$ If the triangle has perimeter $80,$ how long is the shortest side?

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14

Select all of the following expressions that are equal to 2.5.