Ben can do 50 sit-ups in 3 minutes. At that rate, how many sit-ups can he do in 12.5 minutes? What is Ben's unit rate for doing sit-ups?

An electronics manufacturer wants to know if customers would be interested in a detachable keyboard for their tables and if so, what the most important features would be. the manufacturer partners with an electronics store to include copies of the survey with every purchase at that store for one week. which of the following best explains why this random sample is unlikely to be a good representative sample of tablet owners' preferences for a detachable keyboard? a) one week is likely not enough time to get a large enough sample. b) most people won't bother to send in the survey, which is likely to skew the results c) there is no way to verify whether the responders to the survey actually own a tablet d) the survey is biased because it was conducted through an electronics store, not the general population

Which of the following expressions is equal to 2x^2+8

Which expression is equivalent to -5(3x - 6/7)