Last year, raul estimated that he would need 480 night lights, but he sold 420 night lights. this year, he bought 425 night lights and only sold 375. which set of statements about the percent errors for the two years is true? the percent error for this year was lower. raul estimated better last year. the percent error for this year was higher. raul estimated better last year. the percent error for this year was lower. raul estimated better this year. the percent error for this year was higher. raul estimated better this year.

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

Find the solution of system of equation y= x-4 y=4x+2

Me because some of question i don’t understand