The units digit of (10)^(87) + (5)^(46) is:
Choose one.
A) 2  B) 4  C) 6  D) 8  E) 0
any power of anything ending in 5 always has a units digit of 5. So the first term has a units digit of 5. Done.   The second term anything power to 10 unit digit will be zero   then   5 + 0= 
<gadget id="calculator">  5 + 0</gadget>
<output>5</output>
5,   0
<result>E</result>
The units digit of (10)^(87) + (5)^(46) is: