The formula for surface area is SA = 2 (wl + hl + hw). Plugging in the numbers that we know, we get SA = 2 (100 + 10h +10h). We know that the crust accounts for half of the surface area.
The surface area was not provided so this is the closest I can go without the provided surface area. I hope this helps you :)
I would normally write it like this : x(15 + 24a)...but ur answer choices have it like this : (15 + 24a) x
Answer:
yes its a proportion
Step-by-step explanation: