Combine the like terms to simplify the expression:
5 + 7 + 15xy2 + 9y3 + 10x –13xy2 – 3x – 8y3
a.
y3 + 2xy2 + 7x + 12
b.
y3 –2xy2 + 10x + 15
c.
y3 + 2xy2 + 10x + 1
d.
y6 + 2x2y2 + 10x + 12

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

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list