<span> allows you to </span>do<span> repeated addition quickly and efficiently</span>
Answer:
3
+9x-30
Step-by-step explanation:
Multiply the three into each number
3
+9x-30
It's dependent on the context. A book may ask you to find the f'(x) of a function and you may have to use a u sub in your problem which requires you to find the dy/dx of what you substitute. So in this case both would be used.
the answer to your question is 6/7 × 1 1/4 = 3/14