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3 years ago

Select the numbers that will round 8.4 when rounded to the nearest tenth.

Mathematics

2 answers:

horsena [70]3 years ago

7 0

The answers are the first one, the second one and the last one ; 8.42, 8.35, 8.44

inysia [295]3 years ago

4 0

First, second, and last box are correct

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Answer asap-30 points

Alex_Xolod [135]

Answer: D
Explanation: I am not completely sure but the angles would be the same because they are right next to eachother
Hope this helps ;)

7 0

2 years ago

Evaluate (6 + 2i) / (3 –i ). 5/4 + 6/4i 8/5 + 6/5i 20/8 + 12/8i 16/9 + 12/9i

Yuki888 [10]

We are given with a complex no. and need to simplify it , so let's start !!!

Let's assume that :

${:\implies \quad z=\sf \dfrac{6+2\iota}{3-\iota}}$

Now , Rationalizing the denominator or in other words multiplying and dividing ${z}$ by the conjugate of the denominator

${:\implies \quad z=\sf \dfrac{6+2\iota}{3-\iota}\times \dfrac{3+\iota}{3+\iota}}$

${:\implies \quad z=\sf \dfrac{(6+2\iota)(3+\iota)}{(3-\iota)(3+\iota)}}$

${:\implies \quad z=\sf \dfrac{6(3+\iota)+2\iota (3+\iota)}{(3)^{2}-(\iota)^{2}}\quad \qquad \{\because (a-b)(a+b)=a^{2}-b^{2}\}}$

${:\implies \quad z=\sf \dfrac{18+6\iota +6\iota +2(\iota)^{2}}{9-(-1)}\quad \qquad \{\because (\iota)^{2}=-1\}}$

${:\implies \quad z=\sf \dfrac{18+12\iota -2}{10}}$

${:\implies \quad z=\sf \dfrac{16+12\iota}{10}}$

${:\implies \quad z=\sf \dfrac{16}{10}+\dfrac{12\iota}{10}}$

${:\implies \quad {\bf \therefore}\quad \underline{\underline{z=\bf \dfrac{8}{5}+\dfrac{6}{5}\iota}}}$

Hence , Option B) (8/5) + (6/5)i is correct :D

7 0

2 years ago

What is the measure of an angle whose complement and supplement equal 200?

dmitriy555 [2]

The complement is 90-n and the supplement is 180-n. If I understand your wording properly, we now know that 90-n + (180-n) = 200.

-2n + 90 + 180 = 200. Solve for n: 270-200 = 2n, so n = 35 degrees.

3 0

3 years ago

Read 2 more answers

Plz help me if you can

Scrat [10]

Answer:

Hey there!

These triangles can be proved congruent by the HL Theorem.

Hope this helps :)

3 0

3 years ago

Read 2 more answers

What is the answer to 13-3n < -8

zaharov [31]

First you should subtract 13 from -8.
Then divide the answer by -3.
Because you are dividing by a negative number, reverse the sign and you will get your answer.

13 - 3n < -8
-8 - 13 = ?
-3n < ?
?/-3 = n

Like in this example,
3 - 5n < 13
13 - 3 = 10
-5n < 10
10/-5 = -2
n > -2

4 0

3 years ago