Which expression is equivalent to (2−√−4)+(1+√−49)?
3−5i
3+5i
8+0i
−2+0i

3 + 5i.

Step-by-step explanation:

(2−√−4)+(1+√−49)

√−4 = 2i  and

√−49 = 7i.

So   (2−√−4 + (1+√−49

= ( 2 - 2i) + (1 + 7i)

=  3  + -2i + 7i

= 3 + 5i.

arithmetic sequence

step-by-step explanation:

given that a sequence has terms as

19, 15, 11,

this is represented on a graph

the pattern indicates that the sequence is an arithmetic sequence with i term

a=19 and common difference d =-4

any general term

thus the sequence is reduced by 4 for each successive term starting from 1 and nth term is

24-5n.

first negative term would start after 5th term

5th term =24-25< 0

from 5th term onwards the sequence would be negative.

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