Aresearcher wants to determine if people who watch 2 or more hours of television a day are happier than those
who don't watch television. the researcher randomly picks 20 people. half were asked to watch television for at
least 2 hours a day for 2 weeks and the other half were asked not to watch television for 2 weeks.
what type of research is this?
an observational study
a census
a survey
an experiment

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.