Determine the equation of combined variation. then solve for the missing value.

x varies directly with y and inversely with z.
x = 5 when y = 10 and z = 5.
find x when y = 20 and z = 10.

its not 10

If w = 6 units, x = 3 units, and y = 5 units, what is the surface area of the figure? 168 units2 240 units2 144 units2 96 units2

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?