Nicole and her children went into a Grocery store and she bought $6 worth of apples and bananas. Peach apple costs one hour and his banana cost $0.50 . She bought four times as many as apples. By following the steps below determine the number of Apple‘s, x , and a number of bananas, y , that Nicole bought

Answer this question, only if you know the answer. 30 points and brainliest!

Which of the following are identities? check all that apply. a. cos(x + y) + cos(x - y) = 2009 xcosy o b.cos(x + y) - cos(x - y) = 2 coexcosy c. sin(x + y) + sin(x - y) = 2cosxsiny d. tar(x - 25) = tan x

Astudy of an association between which ear is used for cell phone calls and whether the subject is left-handed or right-handed began with a survey e-mailed to 5000 people belonging to an otology online group, and 717 surveys were returned. (otology relates to the ear and hearing.) what percentage of the 5000 surveys were returned? does that response rate appear to be low? in general, what is a problem with a very low response rate?