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Rainbow [258]
3 years ago
8

I need serious help I don't know if I'm so stupid so help me

Mathematics
1 answer:
Crazy boy [7]3 years ago
4 0
Um your picture wont show do it again

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Rationalize the denominator of square root of negative 49 over open parentheses 7 minus 2 i close parentheses minus open parenth
navik [9.2K]

The answer is the option d, which is: d) \frac{-77+21i}{130}

The explanation for this problem is shown below:

1. Smplify the denominator and rewrite the numerator in this form:

\frac{7i}{7-2i-4-9i} \\\frac{7i}{3-11i}

2. Multiply the denominator and the numerator by the conjugated (3+11i) and simplify the expression, as following:

\frac{7i(3+11i)}{(3-11i)(3+11i)} \\ \frac{21i+77i^{2}}{121+9}  \\ \frac{-77+21i}{130}

3. As you can see, you obtain the expression shown in the option mentioned above.

3 0
4 years ago
Round 2.873 to the nearest tenth
blondinia [14]

Answer:

2.9

hope this helps

have a good day :)

Step-by-step explanation:

8 0
3 years ago
Help plz:)))I’ll mark u Brainliest
zheka24 [161]

Answer: The answer is 10

3 0
3 years ago
Vic and Eva buy used cars at the same time. Eva buys a car with 7,000 miles on it. She drives an average of 400 miles per week.
ArbitrLikvidat [17]

Answer:

D) m= 400w + 7000

Step-by-step explanation:


6 0
3 years ago
Which of the following graphs best represents the solution to the pair of equations below? y = −x + 6 y = 2x − 3 A coordinate pl
spayn [35]

Answer:

The lines are 

i)  y=-x+6

ii) y=2x-3

The solution of the system of equations is found by equalizing the 2 equations:

-x+6=2x-3

-2x-x=-6-3

-3x=-9

x=-9/(-3)=3

substitute x=3 in either i) or ii):

i)  y=-3+6=3

ii) y=2(3)-3=6-3=3

(the result is the same, so checking one is enough)

This means that the point (3, 3) is a point which is in both lines, so a solution to the system.

In graphs, this means that the lines intersect at (3, 3) ONLY

Answer: The graph where the lines intersect at (3, 3)

6 0
3 years ago
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