What is the equation for this line ?

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!