Sup community simplify this in 5 mins −5·(−a)·(−a)·(−4)·a thx 4 help1!111

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

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?