If ( 5^w )( 5^x ) = 5^y / 5^z , what is z in terms of w, x and y?
a) y/wx b) y-w-x c) w+x-y d) y-wx e) y/w+x

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220