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OLga [1]
3 years ago
10

Micah found the vertex for the function y= -9.5x? 47.5x+ 63 as shown. Find and correct Micah's error. Explain the error?

Mathematics
1 answer:
AveGali [126]3 years ago
5 0

Answer:

See Explanation

Step-by-step explanation:

The question is incomplete as Micah's workings is not attached. So, there's no way to determine where Micah's error is.

However, I'll solve for the vertex of the given function.

Given

y = -9.5x^2 + 47.5x + 63

Vertex, V is of the form:

V= (h,k)

Where

h = -\frac{b}{2a}

and

k = f(h)

Solving for h:

y = -9.5x^2 + 47.5x + 63

y = ax^2 + bx + c

So:

a = -9.5

b = 47.5

c = 63

h = -\frac{b}{2a}

h = -\frac{47.5}{2 * -9.5}

h = -\frac{47.5}{-19}

h = \frac{47.5}{19}

h = 2.5

Solving for k

k = f(h)

k = f(2.5)

Substitute 2.5 for x in y = -9.5x^2 + 47.5x + 63

k = -9.5 * 2.5^2 + 47.5* 2.5 + 63

k = -59.375+ 118.75 + 63

k = 122.375

Hence:

The vertex is

V = (2.5,122.375)

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Step-by-step explanation:

To find the original price, first we need to answer, \$\greenD{1.54}$1.54dollar sign, start color #1fab54, 1, point, 54, end color #1fab54 is \blueD{5.5}\%5.5%start color #11accd, 5, point, 5, end color #11accd, percent of what number?

Hint #22 / 5

Percent means per hundred, so \blueD{5.5}\%5.5%start color #11accd, 5, point, 5, end color #11accd, percent is equivalent to \blueD{\dfrac{5.5}{100}}

100

5.5

​

start color #11accd, start fraction, 5, point, 5, divided by, 100, end fraction, end color #11accd which is also equal to \blueD{5.5\div 100}5.5÷100start color #11accd, 5, point, 5, divided by, 100, end color #11accd.

\blueD{5.5 \div 100 = 0.055}5.5÷100=0.055start color #11accd, 5, point, 5, divided by, 100, equals, 0, point, 055, end color #11accd

Hint #33 / 5

To find the original price, we need to know \blueD{0.055}0.055start color #11accd, 0, point, 055, end color #11accd times what number equals \greenD{1.54}1.54start color #1fab54, 1, point, 54, end color #1fab54.

\blueD{0.055} \maroonD{x} = \greenD{\$1.54}0.055x=$1.54start color #11accd, 0, point, 055, end color #11accd, start color #ca337c, x, end color #ca337c, equals, start color #1fab54, dollar sign, 1, point, 54, end color #1fab54

Hint #44 / 5

\begin{aligned} \blueD{0.055} \maroonD{x} &= \greenD{\$1.54} \\\\ \dfrac{\blueD{0.055} \maroonD{x}}{\blueD{0.055}} &= \dfrac{\greenD{\$1.54}}{\blueD{0.055}} \\\\ \maroonD{x} &= \maroonD{28} \end{aligned}

0.055x

0.055

0.055x

​

x

​

 

=$1.54

=

0.055

$1.54

​

=6600

7 0
2 years ago
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