Kris joined a gym. She paid $2 each time she went to the gym. She also paid a fee for a locker key each time she went to the gym
1 answer:
Answer:
B. Divide both sides by 21.
Step-by-step explanation:
We have been given that Kris joined a gym. She paid $2 each time she went to the gym.
Kris also paid a fee for a locker key each time she went to the gym. Kris went to the gym 21 times last month and paid a total of $52.50.
The equation can be used to find x, the cost for a locker key.
Let us solve our given equation. To solve our given equation we will divide both sides of equation by 21.
Therefore, the 1st step in solving our given equation to find x, will be divide both sides of equation by 21 and option B is the correct choice.
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Answer:
There are 165 ways to distribute the blackboards between the schools. If at least 1 blackboard goes to each school, then we only have 35 ways.
Step-by-step explanation:
Essentially, this is a problem of balls and sticks. The 8 identical blackboards can be represented as 8 balls, and you assign them to each school by using 3 sticks. Basically each school receives an amount of blackboards equivalent to the amount of balls between 2 sticks: The first school gets all the balls before the first stick, the second school gets all the balls between stick 1 and stick 2, the third school gets the balls between sticks 2 and 3 and the last school gets all remaining balls.
The problem reduces to take 11 consecutive spots which we will use to localize the balls and the sticks and select 3 places to put the sticks. The amount of ways to do this is As a result, we have 165 ways to distribute the blackboards.
If each school needs at least 1 blackboard you can give 1 blackbooard to each of them first and distribute the remaining 4 the same way we did before. This time there will be 4 balls and 3 sticks, so we have to put 3 sticks in 7 spaces (if a school takes what it is between 2 sticks that doesnt have balls between, then that school only gets the first blackboard we assigned to it previously). The amount of ways to localize the sticks is . Thus, there are only 35 ways to distribute the blackboards in this case.