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maksim [4K]
1 year ago
5

(Combining Equations)What is the result of adding these two equations ? 2x + 3y = -5 5x - y = -12

Mathematics
1 answer:
lara [203]1 year ago
3 0

7x +2y =-17 ..... Finally, answer

2x + 3y = -5

+

5x -y = -12

---------------------------

7x +2y = -17

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Area of a circle is 80 cm². Work out the circumference of the circle.
GuDViN [60]

Answer:

The circumference of circle is: 31.714 cm

Step-by-step explanation:

Let C be the circumference of the circle

And A be the area of circle

It is given that:

A = 80cm^2

We have to find the radius first so that it can be used to find the circumference

The area of circle is given by the formula:

A = \pi r^2

Putting the value of area

80 = 3.14 * r^2\\\frac{80}{3.14} = r^2\\r^2 = 25.477

Taking square root on both sides

\sqrt{r^2} = \sqrt{25.477..}\\r = 5.0475\ cm

Now

C = 2\pi r

Putting the value of radius

C = 2 * 3.14 * 5.05\\C = 31.714\ cm

Hence,

The circumference of circle is: 31.714 cm

3 0
3 years ago
can someone just poat a lot of questions and make me brainliest i need it to get to the next "level" I'll make you brainliest ​
geniusboy [140]

Answer:

ok

Step-by-step explanation:

7 0
3 years ago
Which values of x and y would make the following expression represent a real number? (4 + 5i)(x + yi)
Verizon [17]
4 (x + yi) +5 (x + yi)
(4x + 4yi) + (5x + 5yi)
4x _5x +4yi _5yi
_1x + _1yi
therefore x= _1
7 0
4 years ago
Read 2 more answers
NEED HELP ASAP !!!!!!!!!!
romanna [79]

Rule 1: Simplify all operations inside parentheses.

Rule 2: Perform all multiplications and divisions, working from left to right.

Rule 3: Perform all additions and subtractions, working from left to right.

Rule 1: Simplify all operations inside parentheses.

Rule 2: Simplify all exponents, working from left to right.

4 0
4 years ago
Why is the square root of (-5)^2 25 but the square root of -5^2 is -25? ‍
ipn [44]

Step-by-step explanation:

<h2><em>So, we call 5 the “square root” of 25 and write √25=5 because 52=25 . ... Since (−5)2 also equals 25 it is also a “square root” of 25 , but we write −√25=−5 because it is not the principal square root. Not all whole numbers have a whole number square root. For instance √2=1.414213562…</em></h2>
6 0
3 years ago
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