Answer:.
Step-by-step explanation:
Answer:
Plumber A
Step-by-step explanation:
Given the following :
Hours ___repair cost
________A ____B____C_____D
1 ______$35___55___50____50
2 _____ $65__ $75__ $75__ $60
3 _____ $95__ $95 _$100 ___$70
Charge plan:
Flat fee(x) + hourly rate(y)
For 1 hour:
Plumber A:
x + y = 35 ; x = 35 - y
x + 2y = 65 ;
35 - y + 2y = 65
y = 65 - 35 = $30 hourly
Plumber B:
x + y = 55 ; x = 55 - y
x + 2y = 75 ;
55 - y + 2y = 65
y = 65 - 55 = $10 hourly
Plumber C:
x + y = 50 ; x = 50 - y
x + 2y = 75 ;
50 - y + 2y = 65
y = 65 - 50 = $15 hourly
Plumber D:
x + y = 50 ; x = 50 - y
x + 2y = 60 ;
50 - y + 2y = 60
y = 65 - 50 = 10 hourly
Hence, Plumber A charges the highest hourly rate at $30 per hour
Answer: P(9,4)
Step-by-step explanation:
Given situation : Komi has 9 differently colored square tiles, and he wants to put four of them together larger square consisting of four tiles.
Since , the tiles he put in square will be in order, so he use permutation to calculate the number of ways to the tiles in the big square.
Since, the number of permutations to n objects taking r a a time is given by :-
Similarly, the number of permutations to 9 objects taking 4 a a time is given by :-
You can multiply both sides by 2 so you get 8\18. 8\18 is equivalent to 4\9. You can also multiply 4\9 by any other natural number as long you multiply both numbers of the fraction by the same natural number.
Answer:
Step-by-step explanation: