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zalisa [80]
3 years ago
15

How do you do solve 13 a and b?

Mathematics
2 answers:
tiny-mole [99]3 years ago
7 0

Answer:

Step-by-step explanation:

Let A=ax²+bx+c

x=1,A=a+b+c or 7=a+b+c   ...(1)

x=2,A=4a+2b+c or 12=4a+2b+c   ...(2)

x=3,A=9a+3b+c or 15=9a+3b+c   ...(3)

subtract (1) from (2) & (3)

3a+b=5   ...(4)

8=8a+2b

or 4a+b=4   ...(5)

subtract (4) from (5)

a=-1

from (4)

-3+b=5

b=5+3=8

b=8

from (1)

-1+8+c=7

c=0

so A=-x²+8x

thus  table shows it is quadratic.

b.

A=-x²+8x=-(x²-8x+16-16)

or A=-(x-4)²+16

vertex is (4,16)

german3 years ago
6 0
For a you have to find the formula. for ex. 1+x=7 so you solve for x.
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Answer: 13.85kg Hope this helps, please consider making me Brainliest.

Step-by-step explanation:

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2 years ago
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Need help with 19-20 your suppose to simplify the expression
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3 0
3 years ago
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Drupady [299]
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4 0
3 years ago
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Find the values of x and y
qaws [65]

Answer:

y=30

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Step-by-step explanation:

The triangle has all sides equal therefore all the angles are equal.

For all the angles to be equal and add up to 180 (sum of angles in a triangle is 180), each angle has to be 60.

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8 0
3 years ago
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