Question 498982
It's 30 less than 15.

-15______-10_______-5_______0________5________10_________15

Note about this:  When they say less than or equal to graph the number with a filled in dot, but when they say just less than or greater than use a little circle.  The line above would have a filled in dot at -15 and one it 15.  It represents all numbers between -15 and 15.