Asoma das idades de carlos e mário é 40 anos. a idade de carlos é 3/5 da idade de mário. qual idade de mário?

Can someone pls ! pls answer all. no explanation needed..

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.