60% is the answer bebe :)
Answer:
the right answer is d
I hope it is helpful for you
In order to solve this exercise you need to remember the following symbols in Inequalities:
1. The meaning of this symbol is "Greater than":

2. The meaning of this one is "Less than":

3. The following symbol means "Less than or equal to":

4. And this one means "Greater than or equal to":

Knowing the above, you can determine that the statement "c is less than 6", can be written as the following inequality:

The answer is:
The really short answer is, there are 5 weeks, and the temperature dropped a total of -15 celsius on those 5 weeks, how many times does 5 go into -15? -15/5 or -3, so each week, evenly it dropped -3 celsius, and after 5 weeks, it added up to -15 celsius total from the first one.
so in the first week, or week 1, it dropped -3(1), on week 2 it dropped -3(2) on week "w" it dropped -3(w), f(w) = -3w.