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Zina [86]
3 years ago
5

Efectuati! (-1)+2+(-3)+4+(-5)+...+(-19)+20 Ajutati-ma, va rog!

Mathematics
1 answer:
alexira [117]3 years ago
8 0

Answer:10

Step-by-step explanation:

2+4+6+.....+20- (1+3+5+7+...+19)=(2-1)+(4-3)+(6-5)+....+(20-19)=1+1+...+1 ( de 10  ori= 10 times)

=10

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If you received a 3% raise in 2012 and you made 47,000 in 2011, how much would you make more in 2012
tia_tia [17]
47000 is the original salary (100%)
3% of 47000 is :
0.03 x 47000
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8 0
3 years ago
After arranging the terms in descending powers of a variable, select the opposite of the polynomial.
kondaur [170]

Answer: -4n3+12n2+7n-9

Step-by-step explanation: it basically the opposite sign (positive or negative) switched, and the order backwards. hope that helped

6 0
3 years ago
Solve: <br>x + y = 7<br>3x - 2y = 11<br><br>By using Substituting method.​
Salsk061 [2.6K]

\large\underline{\sf{Solution-}}

\sf  \longmapsto x + y = 7 \: \: - - - (i)

\sf  \longmapsto 3x - 2y = 11 \: \: - - - (ii)

<u>By first equation,</u>

\sf  \longmapsto x + y = 7

\sf  \longmapsto x = 7 - y

<u>Now, we can find the original value of y.</u>

\sf \longmapsto 3x - 2y = 11

\sf  \longmapsto 3(7 - y) - 2y = 11

\sf  \longmapsto 21 - 3y - 2y = 11

\sf  \longmapsto 21 - 5y = 11

\sf  \longmapsto - 5y = 11 - 21

\sf  \longmapsto - 5y =  - 10

\sf  \longmapsto y = \dfrac{ - 10}{ - 5}

\sf  \longmapsto y = 2

<u>Now, we can find the original value of x.</u>

\sf  \longmapsto x + y = 7

\sf  \longmapsto x + 2 = 7

\sf  \longmapsto x = 7 - 2

\sf  \longmapsto x = 5

Therefore, the values of x and y are 5 and 2 respectively.

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3 years ago
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4 years ago
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Answer:

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So both missing legs of the triangle are at fixed angles.  The missing angle is 90° (if one is 30° and the other is 60°, then the last angle must add up to 180°, so it is 90°)

Since the last angle is also fixed, it means that there is only one way for the legs to intersect to cause a 90° angle, so there is only one triangle that can be formed

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