Write 9/20 as a decimal

Mathematics

1 answer:

Oksanka [162]3 years ago

6 0

Answer:

0.45

Step-by-step explanation:

Divide 9 by 20.

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The parabola y=ax^2+bx-10 passes through the points (4.5,8) and (-2.5, 15). Determine the values of a and b

yuradex [85]

$y=ax^2+bx-10 \\ \\
(4.5,8) \\
8=a \times 4.5^2 + b \times 4.5-10 \\
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(-2.5,15) \\
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The system of equations:
$18=20.25a+4.5b \ \ \ |\times 5 \\
25=6.25a-2.5b \ \ \ |\times 9 \\ \\
90=101.25a+22.5b \\
\underline{225=56.25a-22.5b} \\
90+225=101.25a+56.25a \\
315=157.5a \ \ \ |\div 157.5 \\
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25=6.25 \times 2-2.5b \\
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3 + 3 - 6 = 0
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