Which of the following is an arithmetic sequence? 2, 4, 8, 16, ... 12, 4, 4/3, 16/3 ... 1/2, -1/2, -3/2, -5/2 ... 1/2, -1/2, 1/2
andre [41]
Answer:
the third one, because it has a common difference
I think u add not sure though
W= 24
Because use inverse operations so add 9 on both sides, that means the -9 on the left side is canceled out, remaining with W=24
Let f=number of five pound and e=number of eight pound dumbbells
5f+8e=282
8e=282-5f
e=(282-5f)/8
...
8f+12e=432, using e found above
8f+12(282-5f)/8=432
64f+12(282-5f)=3456
64f-60f+3384=3456
4f+3384=3456
4f=72
f=18, since e=(282-5f)/8
e=24
So there are 18 five pound and 24 eight pound dumbbells in the shipment.
We know that for each triangle made up by dashed line segment forms 30° angles, so, for example, ∠GOH is 30° and then ∠HOI is 30°
Rotating the shape 240° around the centre is the same as counting in 30°
The triangle GOH will first fit the triangle HOI then triangle IOJ and so on until it has completed 8 times 30° turn. Its final position is shown in the diagram below