She made the mistake of grouping unlike terms and factorizing.
Given that
Helene is finding the sum (9 + 10i) + (–8 + 11i).
She rewrites the sum as (–8 + 11)i + (9 + 10)i.
We have to determine
Which statement explains the property of addition that she made an error in using?
According to the question
The mistake she did is in the second term distributing.
(9+10i) is not equal to (9+10)i
Similarly (-8+11i) is not equal to (-8+11)i.
The correct method she should have done is given below;
Grouping real terms together and imaginary terms together and finding the sum is,

Hence, she made the mistake of grouping unlike terms and factorizing.
To know more about Complex Number click the link given below.
brainly.com/question/10078818
Answer:
I cant see good
Step-by-step explanation:
<span>(4x ÷ 2) - 9y
is difference of two terms.</span>
Answer:
Step-by-step explanation:
<u>Count the number of letters</u>
- 1 = one ⇒ 3 letters
- 2 = two ⇒ 3 letters
- 3 = three ⇒ 5 letters
- 4 = four ⇒ 4 letters
- 5 = five ⇒ 4 letters
- 6 = six ⇒ 3 letters
Answer:
44
Step-by-step explanation:
1/2(n + 6) < 25 Distribute
1/2n + 3 < 25
- 3 - 3 Subtract 3 from both sides
1/2n < 22 Multiply both sides by 2 or divide by 1/2
n < 44
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