Answer:
see explanation
Step-by-step explanation:
RS = s-r (s, r are the position vectors of R and S )
RS = (10, - 4, 0 ) - (3, 7, - 1) = (10 - 3, -4 - 7, 0 - (- 1)) = (7, - 11, 1 )
| RS | = 
= 
= 3
Answer: One solution, I think
Step-by-step explanation: If you combine like terms, x=4
I don’t know the answer sorry
Answer:
1) either 5 or 6 students in the group
2) 6 rooms are booked
Step-by-step explanation:
1) x students
3x + 8 = apples
5 (x-1) + y (the one get less than 5 apples)
3x + 8 = 5 (x - 1) + y
3x + 8 = 5x - 5 + y
2x + y = 13
X 1 2 3 4 5 6
Y 11 9 7 5 3 1
because y < 5 so x = 5 or x = 6
2) x rooms are booked
4x + 20 total students
8 (x-1) + y (the students in room not full))
4x + 20 = 8 (x-1) + y
4x + 20 = 8x - 8 + y
4x + y = 28
X 1 2 3 4 5 6
Y 24 20 16 12 8 4
y < 8 answer is 6 rooms
