Well 75x12=900 so 900 divided by 40 is 22.5 so 22 teachers can have 40 chalks but the principal needs to order another 20 :)
Surface Area of Cube = width^2 * 6 (sides of the cube)
Therefore, (3.5)^2 * 6 =
73.5 [whatever units]^2
6x+35 is the answer to your question
3rd one there cant be anything under or over a line so it cant be the circle or the parabola so it has to be the 3rd one
