Step-by-step explanation:

Answer:
The answer to your question is: letter C
Step-by-step explanation:
Data
A (-5 , -1)
B (-2, 3)
C (6, -3)
Perimeter = ?
Formula

distance AB 



d = 5
Distance BC 


d = 10
Distance AC 



d = 11.2
Perimeter = 5 + 10 + 11.2
= 15 + 
Percentages? Are you sure that’s not a mistake
Answer:
The answer is <em>C</em>
Explanation: Given:A security alarm requires a four-digit code. The code can use the digits 0–9 and the digits cannot be repeated.
there is only 2 numbers which are greater than 7 i.e. 8 and 9. ∴ there is 2 possibility for first place.
For the remaining 3 digits there is 9 possibilities (including 1 which would left after choosing 1 from first place )
No of ways for the alarm code beginning with a number greater than 7= 2 P 1 x 9 P 3
<em>Total ways of code with 4 digits= 10 P 4.</em> Hope this helps :)