Answer:
im not sure if this answer is correct but i think its 22
X2+-4x+4=20 the final answer is 20!
Answer:
n = 6
Step-by-step explanation:
4n + 2 = 26,
4n = 24,
n = 6
I mean probably of getting head is a half if that's what u mean but what is a,b,c,d
If you have multiple equations with multiple variables, you can either do clever substitutions, or turn it into a matrix on which you can perform linear combinations or multiplications (Gauss elimination)
1 1 1 1
2 1 -1 8
1 -1 1 -5
(note how the above 3 rows represent the 3 equations, just got rid of the variables, plus sign and equals sign)
subtract row1 from row3, that eliminates x and z from row 3.
1 1 1 1
2 1 -1 8
0 -2 0 -6
divide row3 by -2, that will give y a factor of 1
1 1 1 1
2 1 -1 8
0 1 0 3
The last row now says y=3
