Which sum does the model below represent?

4 positive tiles and 7 negative tiles.

3 Negative Tiles; -3

Step-by-step explanation:

Let's say tiles = T

- If the equation relates to 4PT ± 7NT, then your answer is -3NT

4 + (negative 7)

Step-by-step explanation:

I hope this helps

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!