You always have to perform the operation in parenthesis before adding so the first step is to multiply 5 and 8 which is equal to 40. Then you add 2 and get 42.
You have a bag of marbles containing 4 green, 2 red, 5 yellow and 6 pink. You reach into the bag and pull out a green marble and put it on the table. What is the probability the next marble you pull out is yellow.
Probability is the chances or number of times something can happen divided by the total number of possible events. So the number of times you can pick a yellow is six. The number of possible events is the total number of marbles in the bag. So its 2 red + 5 yellow + 6 pink + 3 green=116. It is 3 green and not 4 because you already took 1 green out. So the probability of picking a yellow marble is 6/16 = .375 or 37.5%
You have$15 to buy 2 balls and a baseball mitt. The baseball mitt cost $7. How much must each ball cost if there will be no change.
You need to set up an equation. You will set it equal to your budget, $15. The equation will need to take into account the cost of the baseball and the mitt. So we know the cost of the mitt is $7 we need to find the cost of the balls. There are two balls so we can take the price of one ball,X, and multiply it by two. So the equation is $15=$7+(2*X). We need to get the X by itself so we can subtract the $7 from each side of the equation making it $8=2*X. Finally to find X we need to divide each side of the eqaution by 2. ($8/2)=((2*X)/2)=>$4=X. So each ball costs $4.