**NOTE: The exercise instructions here are LONG — please read them all carefully. If you see an internal scrollbar to the right of these instructions, be sure to scroll down to read everything.**

Write an arithmetic __expression__ that calculates the average of 18 and 46.

*You may* *already**know that:*

*the average of two numbers is their***sum***divided by 2**the symbol for division is**/, thus 10 divided by 5 is written as 10/5**division has higher arithmetic precedence than addition**parentheses (()’s) may be used to override precedence*

*Thus, one correct solution would be:*

*(18+46)/2Try it– enter the above solution and click the* *submit* *button!*

*Even with an exercise as simple as taking the average of 18 and 46 it is still possible to make mistakes. For example:*

*we might forget to use parentheses:**18+46/2**or, we might use the wrong arithmetic***operator***:(18-46)/2*

*Try these and see the system feedback. Also try entering some of your own incorrect answers, and see what you get.*

*Again, what makes programming so interesting is that there are also MANY ways to be right. For example, we could reverse the 18 and 46 and still have a correct answer:*

*(46+18)/2*

*One of the most essential* *components**of all learning is experimentation. Nowhere is this more* *true**than in learning programming. Students should be encouraged to experiment with solutions even after “getting it right”.*

*Having submitted a typical correct solution, a student might experiment with:*

*(18+46)/(3-1)*