Question

which expression is eqivalent to 6× + 10×

Answer 1

16x

Both of these expressions are similar expressions, therefore you can simply add the number in front of the 'x'

6 + 10 = 16

Therefore, 6x + 10x = 16x

Answer 2

since they're like terms...simply just add them;
6x + 10x = 16x
So your final answer is: 16x 
Hoope that helps :D