What is the 21st term of an arithmetic sequence with terms a6=50 and a11=85?

a. 125
b. 155
c. 185
d. 205

For what values of b will f(x)= logbx be a decreasing function? (16 )

(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

What is the y intercept of f(x)=(1/2)^x?