Jack scored 90, 92, 94 and 96 on his first four tests. what is the minimum score he would need to earn on his next test to score an average of 94?

The average is calculated by adding the scores up and then dividing by the number of scores. 

(90 + 92 + 94 + 96 + x)/5 = 94 (where x is the score he needs)
(372 + x)/5 = 94
multiply both sides by 5.
372 + x = 470
subtract 372 from both sides.
x = 98

Answer/Step-by-step explanation:

Part A: Net A is the correct net. If we decide to fold the net, we'd get the shape of the prism. Folding back net B won't give us the shape of the prism because of the position and arrangement of the right triangular  bases.

Part B:

AB =  3in

BC = 5 in

CD = 9.4 in

Part C: surface area of the prism can be calculated by calculating the area of each part of the net, and summing them together as follows,

Area of the 2 triangular bases = 2(½*base*height of triangle) = 2(½*4*3) = 2*2*3 = 12 in²

Area of the three rectangles =

Surface area of prism = 12 + 112.8 = 124.8 in²