Test your mathematical skills with the Problems of the Week from the Spring 2018 issue of Math Matters magazine!
We solved Problems 1-4.
[Check your solution to Problem 1.](https://iastate.box.com/s/ksn1gldahyjlxnk59bllf29g3itfb9yk)
[Check your solution to Problem 2.](https://iastate.box.com/s/lfwhxa4b2avn1phm3l7m8u0kmrq2q91t)
[Check your solution to Problem 3.](https://iastate.box.com/s/r8zqykcivi84tftyy8j51uxo8j5l7no0)
[Check your solution to Problem 4.](https://iastate.box.com/s/yneb8swx3yt84ofggedy18rcxp393qfv)
You’ve been working on Problem 5.
Problem 5. An ellipse in the plane has foci at (20; 19) and (55; 59) and is tangent to the y-axis. What is the length of the major axis of the ellipse?
[Check your solution to Problem 5.](https://iastate.box.com/s/769pt3a525xccq8dbntuo2abp5np2ck8)
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Our mathematical challenge is done. We hope you had fun!