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3 years ago

Compute (1 + i)(2 + i)(3 + i).

Mathematics

1 answer:

Butoxors [25]3 years ago

4 0

Answer:

10i

Step-by-step explanation:

multiply the parentheses

to get (2+i+2i+i^2) x (3+i)

i^2=-1

(2+i+2i-1) x (3+i)

collect like terms (1+3i) x (3+i)

multiply this out

3+i+9i+3i^2

3+10i+3(-1)

3+10i-3

10i

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3 years ago

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3 years ago

M is directly proportional to r^3

Oliga [24]

Answer:

r=6

Step-by-step explanation:

Proportions

We know M is directly proportional to $r^3$

This can be written as

$M=kr^3$

Where k is the constant of proportionality which will be determined knowing that when r = 4, M= 160. Substituting in the equation above:

$160=k\cdot 4^3$

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3 years ago

What is the value of y? 1304

miss Akunina [59]

Answer:

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Step-by-step explanation:

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