Answers to do 2.9 math lesson homework 5th grade

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

(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

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle