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ELEN [110]
3 years ago
10

Need help answer plzzzz ​

Mathematics
2 answers:
tatiyna3 years ago
7 0
2n+n+108=180
3n=72
n= 24
dolphi86 [110]3 years ago
5 0

:2n+n+108=180

3n=72

n= 24

Step-by-step explanation: WAIT nvm i got it!!

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Find the sum of the roots of the quadratic x^2 + 7x - 13 = 0
Hoochie [10]

Answer:

-7

Step-by-step explanation:

You use the quadratic formula of ax^{2} +bx+c = 0 to get:

a = 1

b = 7

c = -13

then you plug that into x= (-b ± √b²-4ac)/(2a) :

x= ( -7 ± √7²- 4(1)(-13) )/(2(1))

x=-\frac{7}{2} + \frac{\sqrt{101}}{2} \\\\x=-\frac{7}{2} - \frac{\sqrt{101}}{2}

The sum of these two x values turns out to be:

x=-\frac{7}{2} + \frac{\sqrt{101}}{2}+( -\frac{7}{2} - \frac{\sqrt{101}}{2} )= -\frac{14}{2} = 7

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3 years ago
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k0ka [10]

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8 0
3 years ago
Find the percent of increase from 80$ to 90$
Ivan

Answer: 12.5%

Step-by-step explanation:

80x 12.5%=10

80+10=90

7 0
3 years ago
Read 2 more answers
Solve y = 1/-25 x 8 + 175
Elena L [17]

Answer:

174.68

Step-by-step explanation:

Use PEMDAS. First, multiply 1/-25 by 8. (-8/25 or-.32)

Then, add 175 and y should= 174.68.

8 0
3 years ago
Solve the given equation by completing the square.
Dmitriy789 [7]

Answer:

a = -4, b = 3 and c = 6 (OR)

a = -4, b = -3 and c = 6

Step-by-step explanation:

x^{2} +8x = 38

Add 16 to both sides.

x^{2} +8x+16 = 38 + 16

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x=-4+3\sqrt{6} or x=-4-3\sqrt{6}

Therefore, a = -4, b = 3 and c = 6 (OR)

a = -4, b = -3 and c = 6

6 0
3 years ago
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