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Citrus2011 [14]
3 years ago
13

Multiply and simplify the product. 2i(4 – 5i) Select the product. –2i 2i –10 + 8i 10 + 8i

Mathematics
2 answers:
Lena [83]3 years ago
6 0

Answer:

10 + 8i

Step-by-step explanation:

noting that i² = - 1

Given

2i(4 - 5i) ← distribute the parenthesis

= 8i - 10i² = 8i - 10(- 1) = 10 + 8i

shusha [124]3 years ago
3 0

Answer:

D, 10+8i

Step-by-step explanation:

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Y_Kistochka [10]
We need to call for x minute
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8 0
3 years ago
A contractor is in charge of hiring people for a construction project. The number of days it would take to complete the project
sweet-ann [11.9K]

Answer:

\text{Domain of x}=[1,\infty), x \in Z^+

Step-by-step explanation:

Given the function: f(x)=\dfrac{280}{x},$ where:

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\text{When x=0, }f(x)=\dfrac{280}{0}=$Undetermined\\\text{When x=1, }f(x)=\dfrac{280}{1}=$280 days\\\text{When x=280, }f(x)=\dfrac{280}{280}=$1 day\\\text{When x=560, }f(x)=\dfrac{280}{560}=$0.5 days

The domain of a function is the complete set of possible values of the independent variable.

In this case, the independent variable is x, the number of full-time workers. We have shown that x cannot be zero as there must be at least a worker on ground.

Therefore, an appropriate domain of the function f(x) is the set of positive integers (from 1 to infinity).

\text{Domain of x}=[1,\infty), x \in Z^+

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Step-by-step explanation:

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