6. write the following proportion using colons. 7 is to 21 as 3 is to 9. a. 7: 21 = 3: 9 b. 7: 3 = 21: 9 c. 21: 7 = 3: 9 d. 7: 21 = 9: 3

Lin is shopping for a couch with her dad and heard him ask the salesperson “how much is your commission? ” the salesperson says that her commission is 5 1/2% of the selling price. a.how much commission will the salesperson earn by selling a couch for $495? b.how much money will the store get from the sale of the couch?

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?