¿cual es el porcentaje de ganancia de un comerciante que vende a $4600 un producto que compró a $4000? (con operatorias) (soy de séptimo)

If a =6, what is the value of 2a(3b + 5c)?

What is the missing step in this proof ?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126