Describe different ways that you can show a story problem. use one of the problems in this lesson as your there were 21 children in thelibrary .after 7children left the library, how many children were still in the library?

Total 14 children were still in the library

Step-by-step explanation:

The total number of students in a library is 21. After that 7 children left the library.

If x children arrive in the library, the number of  students in the library are increased by x. It means we have to add x units to the total number of students in the library.

If y children left the library, the number of  students in the library are decreased by y. It means we have to subtract x units from the total number of students in the library.

Since the 7 children left the library, therefore the number of students reduced by 7.

Therefore 14 children were still in the library.

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation: