Answer:
3,6
Step-by-step explanation:
x+y=9
x-y=-3
Adding these two equations we get 2x = 6, x=3
y=6
Answer:
5
Step-by-step explanation:
Answer:
There are 604,800 possible permutations.
Step-by-step explanation:
The order in which the digits are chosen is important, which means that the permutations formula is used to solve this question.
Permutations formula:
The number of possible permutations of x elements from a set of n elements is given by the following formula:

In this question:
7 digits from a set of 10(10 digits to 0-9). So

There are 604,800 possible permutations.
Answer: B
Step-by-step explanation:
Answer:
$24,960
Step-by-step explanation:
1. Find daily salary (12*8 hours = 96/day)
2. find weekly salary (96*5 days = 480/week)
3. find annual salary (480*52 weeks = 24,960/year)