Zack, Teri, and Paco combined the foreign stamps from their collections for a stamp show. Out of their collections,

2

5

of Zack's stamps,

1

6

of Teri's stamps, and

7

8

of Paco's stamps were from foreign countries.

How many stamps were in their display? Complete the explanation of how you solved the problem. Use the table to answer the question.

Stamps Collected

Name Number of Stamps

Zack 20

Teri 24

Paco 32

To find how many foreign stamps were in each person's collection, find the fractional part of each of their collections that were . Then those numbers together.

There were foreign stamps in their display.

30

step-by-step explanation:

times by times

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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