O primo do Zé disse-lhe: "o produto da idade que eu tinha há dois anos pela idade que terei daqui a dois anos é igual a 1221". Que idade tem o primo do Zé?

What two criteria are needed for triangles to be similar

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.