The answer is -4 + 7. Because its subtracting 4 to zero which makes it -4. And then its adding 7 so the answer is -4+7
the initial statement is:

and then:

So the second statement is false because f should be multiply by e, not by d so is option C)
The answer will be 50 quarts using proportion and ratio
4.80/0.12 = 40. So you can buy 40 pencils.