4/21 = 12/63 and 2/9 = 14/63
12/63 < 14/63
In order to answer this problem, let us assume that x is the number of hours (the independent variable) and y is the score obtained (the dependent variable). The value 65.8 is the y-intercept which means that we will get y = 65.8 if x is equal to zero. This means that 65.8 is the score that one can get if he does not study at all.
Each layer has 28
3 layers = 3 x 28 = 84 unit cubes
The formula for the area of a circle when given the diameter is:
