Sn=n/2 (2a1 +(n-1)d)
[s5= 5/2 (2a1 +(5-1)d) = 5a1+10d]
s6=3(2a1+5d) = 6a1+15d
s4=2(2a1+3d) = 4a1+6d
6a1+15d -(4a1+6d) = 5 -----(1)
s7=7/2(2a1+6d) =7a1+21d
6a1+15d + 7a1+21d = 21 -----(2)
(1) 2a1+9d=5 -----(3)
(2) 13a1+36d=21 ----(4)
(3)*4 ; 8a1+36d=20 ----(5)
(4)-(5) 5a1 = 1
so a1 = 1/5
(3) 2a1+9d=5
2(1/5)+9d = 5
9d = 5-2/5 =23/5
d = 23/45
so [s5= 5/2 (2a1 +(5-1)d) = 5a1+10d = 5(1/5) + 10(23/45) = 1 + 5.11 = 6.11 ]
i'm not sure about the answer but the process is correct
Answer:
2 1/2
Step-by-step explanation:
4 x 5/8 = 20/8
reduced
2 1/2
Answer:
The red drone will be at the same height as the blue drone at 33.33 seconds, therefore higher at 34 seconds.
Step-by-step explanation:
Red drone = 100 + 8*seconds
Blue drone = 180 + 5*seconds
100 + 8*seconds = 180 + 5*seconds
3*seconds = 100
seconds = 33.33
Answer:
1 centimeter on the map=125 meters
Step-by-step explanation:
We need to find how many meters for 1 centimeter, because that is the lowest value.
So, divide 8 by 8 to get 1 centimeter.
To get its equal distance, divide 1000 by 8 as well.
1000/8=125
Hope this helps!
Answer:
The net force of the brick is 0N and the brick doesn't move
Step-by-step explanation:
Both forces have the same amounts being applied to on the brick, so the forces will cancel each other out and have no effect on the brick, so the brick won't move.
