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1 year ago

(-3+7i)(1-2i) can you help me with the answer to this

Mathematics

1 answer:

lozanna [386]1 year ago

4 0

Answer:

11 + 13i

Step-by-step explanation:

A must know is that

$\sqrt{i} = - 1$

Complex numbers

1st: foil the equations

$- 3(1 - 2i) + 7i(1 - 2i)$

$- 3 + 6i + 7i- 14 {i}^{2}$

2nd Combine like terms and substitute

$i ^{2} for \: - 1$

$- 3 + 14 + 13i$

$11 + 13i$

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A right rectangular prism is 5 1/4 in. wide, 12 1 2 in. long, and 4 in. tall.

lozanna [386]

Answer: $V = 262\frac{1}{2}$ $cm^{3}$

Step-by-step explanation:

$V = LWH$

$V = 5\frac{1}{4}$ X $12\frac{1}{2}$ X 4

$V = \frac{21}{4}$ X $\frac{25}{2}$ X $\frac{4}{1}$

$V = \frac{525}{2}$

$V = 262\frac{1}{2}$ $cm^{3}$

7 0

3 years ago

13 units from (10,6)

svp [43]

The answer is ( 23,7)

5 0

3 years ago

Use a map to plan a trip in the United States.Find the number of miles between your current location and your destination, and d

ElenaW [278]

Answer:

292.5 miles per day

Step-by-step explanation:

The map shows it is 1170 miles from my school to Wall, South Dakota, a place well-advertised in the Midwest. If I want to take 4 days to get there, the required division is ...

... (1170 mi)/(4 da) = 292.5 mi/da

6 0

3 years ago

Volume question

ioda

Answer:

The answer is 61.4 L

Step-by-step explanation:

Using the formula of cuboid, V = l×b×h, to find the total amount of water contained :

l = 120cm

b = 40cm

h = 15cm

V = 15×120×40

= 72 000cm³

= 72 L

It is given that she uses 10.6L for shower. Then calculate the remaining water by substracting 10.6L from the original amount of water :

remaining = 72 - 10.6

= 61.4 L

8 0

3 years ago

Find the area of this regular polygon. Round to the nearest tenth. 8.8 ft

Akimi4 [234]

Answer:

I don't really know but I'm pretty sure u can fix it and answer this question

7 0

3 years ago