Comment Comment by gus_massa Which kind of math questions?* If a book and a pencil cost $10 and two books and a pencil cost $17, how much does a pencil cost?* What are all the subgroups of a group or order 50?* Integral(x * e^x dx) ? parent gus_massa 5 years ago
* If a book and a pencil cost $10 and two books and a pencil cost $17, how much does a pencil cost?
* What are all the subgroups of a group or order 50?
* Integral(x * e^x dx) ?