Roberto comprou 2 cadernos a R$12,40 cada duas borrachas a R$0,80 centavos cada uma meia dúzia de lápis a R$0,60 centavos e meia dezena de canetas a R$2,10. Se Roberto tinha apenas uma nota de R$50,00quanto recebeu de troco?

Write the product as a trinomial. (x + 2)(x + 3) x2 + 5x + 6 x2 + 6x + 6 x2 + 6x + 5 x2 + 5

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?