X^4+2x^2-48=0 what is the solution set

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

(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

Acircle has a circumference of 28.36 units what is the diameter of the circle