They need to buy six because they will end up with fifty four.
(they cant buy five because they would end up with forty five and that wouldnt be enough)
Answer:
No solution
Step-by-step explanation:
y = 2x + 4 (1)
-2x + y = -5 (2)
Rewrite equation (2)
y = 2x - 5
So now you have 2 equations
y = 2x + 4 (1)
y = 2x - 5 (2)
----------------------------------Subtract
0 = 9
As you know 0 is not equal 9
Answer: No solution
The full sequence from 3 to 21 is...
3, 5, 7, 9, 11, 13, 15, 17, 19, 21
Now first add 3 and 5 to get 8. Then 8 and 7 to get 15. After, add 15 and 9 to get 24 and furthermore.
(24+11=35 --> 35+13=48 --> 48+15=63 --> 63+17=80 --> 80+19=99 --> 99+21=120)
So I believe the sum of the sequence is 120
I hope this helps!
5x - 4. Correct if definetly wrong.