Select the property that allows 3=x

(a) (8%) compute the probability of an even integer among the 100 integers 1! , 2! , 3! , until 100! (here n! is n factorial or n*(n-1)*(n-2) *… 1) (b) (16%) compute the probability of an even integer among the 100 integers: 1, 1+2, 1+2+3, 1+2+3+4, …., 1+2+3+… + 99, and 1+2+3+… + 100

X+y=-4 x-y=2 use elimination with adding and subtraction

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.