There are red blue and black marbles in the bag
the probability of pulling out a red marbles 2/5
the probability of pulling out of black marble is 1/10
one marble is pulled out at random
what is the probability the marble will be blue

2/5 x 2 = 4/10 1/10 + 4/10= 5/10
5/10 - 10/10 = 5/10 The probability of the marble being blue is 5/10

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,