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Elan Coil [88]
3 years ago
7

Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8

Mathematics
2 answers:
mote1985 [20]3 years ago
7 0
x_v=-\frac{b}{2a}\\
x_v=-\frac{7}{2\cdot(-9)}\\
x_v=\frac{7}{18}\\
Verdich [7]3 years ago
4 0
f(x)=-9x^2+7x+8\\\\a=-9;\ b=7;\ c=8\\\\x_{vertex}=\frac{-b}{2a}\\\\x_{vertex}=\frac{-7}{2\cdot(-9)}=\frac{-7}{-18}=\frac{7}{18}
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7 0
2 years ago
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Ray Of Light [21]

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Step-by-step explanation:

3 0
2 years ago
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kondaur [170]
I think its easier to work out part (c) first:-

People who liked anything except burger  = 3/8 + 1/4 + 1/5 =  33/40

So the fraction who liked burgers = 7/40.

7/40 of the total liked burgers   so total people surveyed = (40/7) * 126 =  720

ANswer to c is 720.

a) Number who liked  chicken and laksa = (3/8 + 1/4) * 720  =  450 Answer

b)  Number who liked pasta =  1/5 * 720  =  144

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7 0
3 years ago
If 3 3/4 lb of candy costs 20 .25 how many would 1 lb of candy cost
Mrac [35]

solution:

\frac{c}{w}=\frac{20.25}{\frac{3}{4}}\\\frac{c}{1}=\frac{20.25\times 4}{3}\\\frac{c}{1}=\frac{81}{3}\\c=27\\1Ib cost is \$ 27

3 0
3 years ago
Joe is 10 years older than James and eight years twice Joe’s age will equal three times James eight how old is Joe now.
Lady_Fox [76]
Let James be x years old
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18 = 2x
x = 9

Joe is 19
James is 9
6 0
2 years ago
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