2 years ago

Determine the mean of the following data. Choose the correct option. 7, 8, 9, 2, 4, 5, 12, 9

Mathematics

1 answer:

Brut [27]2 years ago

8 0

Answer:

Step-by-step explanation:

mean means average

there are 8 numbers

add them all up

7+8+9+2+4+5+12+9=56

divide 56 by 8 = 7

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B is between line AC. If AB = x^2– 3x, BC = 9x, and AC = 16. Solve for x.

Nana76 [90]

Answer:

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$\therefore AB + BC = AC\\\therefore x^2 - 3x + 9x = 16\\\therefore x^2 - 3x + 9x - 16=0\\\therefore x^2 + 6x - 16=0\\\therefore x^2 + 8x - 2x- 16=0\\\therefore x(x +8) - 2(x + 8)=0\\\therefore (x+8)(x-2)=0\\\therefore x + 8 = 0\: or \: x-2=0\\\therefore x = - 8 \:or\: x = 2\\\huge \orange {\boxed {\therefore x = \{-8,\: 2\}}}$

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