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Novay_Z [31]
2 years ago
6

I thought of a number, added 21, and then added twice my

Mathematics
1 answer:
ankoles [38]2 years ago
8 0

Answer:

31.5

Because if you Subtract 21 from 84 you get 63
then if you divide 63 by 2 you get 31.5 so your Answer would be 31.5.

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5/6x - 4 = 11 what does x equal?
dezoksy [38]

Answer:

18

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7 0
3 years ago
Read 2 more answers
Solve n3 + 2n2 - 15n = 0 by factoring.
azamat
N³ - 2n² - 15n = 0

"n" 

n (n² + 2n - 15) = 0

n = 0

n² + 2n - 15 = 0

Δ = (2)² - 4(1)(-15)
Δ = 4 + 60 = 64

n' = (-2+8) / 2 = 6/2 =3
n'' = (-2-8) / 2 = -10/2 = -5

Solution:

S {-5 , 0 , 3 }
5 0
3 years ago
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