I need help with this math problem please! At a basketball game, 55% of people attending were supporting the home team, while 45% were supporting the visiting team. If the total number of people attending the game was 520, how many people attending were supporters of the home team?

I’m stuck on this equation, anyone got the answer?

X+y=-4 x-y=2 use elimination with adding and subtraction

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %