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2 years ago

What does the product (-5-2i)(3+7i) equal

Mathematics

1 answer:

Marina CMI [18]2 years ago

8 0

This in what I got:
(-7i)(10i)
-70i

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e) Given the following: Let X = {1, 2, 3, 4) and a relation R on X as R= {(1,2), (2,3), (3,4)}. Find the reflexive and transitiv

Naddika [18.5K]

Answer:

The answer is $\{(1,1),(2,2),(3,3),(4,4),(1,2)(2,3)(3,4),(1,3),(1,4)\}$

Step-by-step explanation:

Remember that a reflexive relation $R\subset \mathcal{P}(X)$ , where $\mathcal{P}(X)$ is the power set of $X$ , is one which conteins the ordered pairs of the form $(a,a)$ , for $a\in X$ .

So, As the reflexive and transitive closure of $R$ (that we will denote by $\overline{R}$ ) is in particular reflexive, we must add to $R$ the elements $\{(1,1) , (2,2),(3,3),(4,4) \}$

A transitive relation $R$ is one in which if the pair $(a,b)$ and the pair $(b,c)$ are in there, then the pair $(a,c)$ must be there too.

So, to complete the relation $R$ to be reflexive and transitive we must add the pair $(1,3)$ (because $(1,2),(2,3)$ are in $R$ ), the pair $(2,4)$ , and the pair $(1,4)$ because we added the pair $(2,4)$ .

Therfore we have that $\overline{R}=\{(1,1),(2,2),(3,3),(4,4),(1,2)(2,3)(3,4),(1,3),(1,4)\}$ .

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2 years ago

You have 25% of the tickets required for a souvenir. What fraction of the required tickets do you have?

lidiya [134]

25% is 1/4

45x1.07 is 48.15
(Convert percent to decimal and add one bc it’s increasing each month. Multiply it by the original cost to get the new cost)

7 0

2 years ago

Read 2 more answers

PLEASE HELP I HAVE 10mins left

kykrilka [37]

Answer:

x=39

Step-by-step explanation:

I can explain later but I know you have a time limit right now.

8 0

2 years ago

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Two angles are vertical angles. One angle is ( 8x + 15 ) and the other angle is 143. Solve for x.

sineoko [7]

Answer:

x = 16

Step-by-step explanation:

Verticle angles are always congruent, so:

(8x + 15) = 143

Now, we can solve to isolate x:

8x + 15 - 15 = 143 - 15 (subtract 15 from both sides)

8x/8 = 128/8 (divide both sides by 8)

x = 16

You can always plug in the value of x to the original equation to check your answer:

8(16) + 15 = 143

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2 years ago

Write the equation of each line described in slope-intercept form (y = mx + b) with a slope of -6 and x-intercept of 4. (4,0)

marissa [1.9K]

Answer:

ill give u the answer if u do 73 divided by 2628

Step-by-step explanation:

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2 years ago