C line is the line of reflection
Answer:
hjgl
Step-by-step explanation:
The total cost without the discount is given by:
$
Then, to find the discounted amount, we make the following rule of three:
10 $ ------------------> 100%
x ----------------------> 20%
From here, we clear the value of x.
We have then:
Then, the cost of the Strawberries with the discount is:
$
Answer:
Kate pays for the strawberries about $ 8.
Since there are no restrictions on the three-digit numbers (for example no repetitions), we actually don't care about the values of the digits. All we need to know is that there are
possible digits, and that we have to extract a triplet from here.
For problems like this we have the binomial coefficient, defined as
This number tells you how many subsets of k elements you can extract from a set of n elements. So, in your case, you want to compute