Pls help i will mark brainliest

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8