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VladimirAG [237]
2 years ago
8

BRIANLIST ANSWER!! Please help on this one question ( if you’re good at this) thanks :))

Mathematics
1 answer:
ivann1987 [24]2 years ago
5 0

Answer:

Step-by-step explanation:

(21²+10²)½ = 23.25= 23.3

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How you do multiply complex numbers ? Example : (9 - 4i) (8 + 6i)
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You multiply them just as you would multiply any normal polynomials, except there is a special rule. Since we know that i = √-1, the rule is that i² = -1. So, let's multiply:

(9-4i)(8+6i) = 72+54i-32i-24i^2

Let's simplify this:

72+22i+(-24*-1)

72+22i+24 = 96+22i

Therefore, your answer is 96 + 22i.

6 0
3 years ago
An item is regularly priced at $70. Keiko bought it on sale for 80% off the regular price. How much did Keiko pay? $
pantera1 [17]

Answer:

$14

Step-by-step explanation:

80% of $70 is $14, saving him $56

8 0
2 years ago
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gladu [14]
The surface area of the cube is 600cm^2.

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3 0
3 years ago
Nelson used 35% of his savings account for his class trip in May. If he used $140 from his savings account while on his class tr
vladimir1956 [14]

Answer:

$400

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140 ÷ 35% = 400

6 0
2 years ago
EMERGENCY PLS
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Answer: Number 1= 2

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2. 22 divided by 2 is 11, 15 divided by 3 is 5, 11x5=55

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2 years ago
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