Answer:
AB = 9
AC = AB + BC
AB = 2x - 3
BC = 5x + 9
AC = 48
AC = (2x - 3) + (5x + 9)
2x - 3 + 5x + 9 = 48
2x + 5x = 48 + 3 - 9
7x = 42
x = 42 : 7
x = 6
AB = 2 · 6 - 3
AB = 12 - 3
C.i need help...
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9
Step-by-step explanation:
5,7,8,10,12,12
5+7+8+10+12+12=54
54/(how many numbers there are, which is 6)=9.
Your mean value is 9.
x=8
(2x + 1)² = x² + (2x - 1)² = x² + (2x - 1)(2x - 1)
(2x + 1)(2x + 1) = x² + 4x²-2x-2x+1
4x²+2x+2x+1 = 5x²-4x+1
4x²+4x+1 = 5x²-4x+1
0= 5x²-4x²-4x-4x+1-1
0= x²-8x
x²-8x=0
x²=8x
3
I have showed the steps in the attached image.
