Your help will be much appreciated. 30 points + brainliest. find exact value of each of the following using half angle formulas​

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

Sum is 17 and their difference is 3