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!