Can someone help me?

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

In a rectangle klmn, km = 6x + 16 and ln = 49. find the value of x

Henry's butcher shop uses an electronic scale that measures to 1/100 of a pound. which is the most accurate measurement based on the limitations of the scale that might be found on a package of meat sold by henry?