<p>its on new BB.
TEST 3. #9. p. 516
If t>w, how much greater is the sum of s and t than the sum of s and w?
a. s-t
b. 2s-w
c. t-w
d. t+w
e. 2s-t-w</p>
<p>answer is c.</p>
<p>t-w because the s is common to both, so the difference between the two numbers which are sums of the components given is the difference in the unshared values.</p>
<p>(s + t) - (s + w)
= s + t - s - w
= t - w</p>