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23.07.2020 •
Mathematics
Simplify the following expressions showing the steps:
(9+9.4i)+(-8.6-4i)
(9.4i)(-4i)
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Ответ:
a) 17.6 + 5.4i
b) 37.6
Step-by-step explanation:
a) (9 + 9.4i) + (8.6 - 4i)
Collect like terms:
9 + 8.6 + 9.4i - 4i
= 17.6 + 5.4i
b) (9.4i)(-4i)
Expand the brackets:
9.4 * -4 * i * i
Therefore, i * i = -1
=> (9.4i)(-4i) = -37.6 * -1
= 37.6
Ответ:
sides are proportional and angles are congruent
Step-by-step explanation:
Every segment in ABCDEFG is parallel to, and double the length of, the corresponding segment in HIJKLMN. All corresponding angles are congruent. Thus, the definition of similar polygons is met:
corresponding sides are angles are congruent.