Find the value of x round the length to the nearest tenth

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Aphrase is shown read the phrase and give me the answer

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?