Is 1 4 7 11 15 20 25 ... an arithmetic sequence explain

Yes

Step-by-step explanation:

Yes, it is an arithmetic sequence. An arithmetic sequence has a certain defined pattern between numbers. If we take this sequence "1,4,7,11,15,20,25" we can see that they have a pattern: to go from 1 to 4 there are 3 numbers, so we can say it's +3. Between 4 and 7, we also have +3. However, between 7 and 11, we have +4 and the same happens with 11 and 15. Moreover, between 15 and 20, that's a +5 and 20 and 25 is another +5. So we have a +n repeating twice, which makes me conclude that this sequence goes like; +3+3+4+4+5+5+6+6+7+7+8+8+9+9... and so on...

i'm sure goog can you get that answer

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!