Eight times the diffrence of a number and seventeen is thirty?

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

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Can someone me with the property questions for 12 13 and 14 plz