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belka [17]
3 years ago
14

The bill was $14.00. She left a 20% tip for the waitress. How much change did she get back from $20.00

Mathematics
1 answer:
drek231 [11]3 years ago
3 0
20%=0.2
14*0.2 = 2.8 ( $2.80 is the tip she will be giving her)
$14+$2.80 = $16.80 ( what she will be giving in total) 
$20-$16.80 = $3.20 (the change she will get back)
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Option A

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<em><u>Solution:</u></em>

<em><u>Given function is:</u></em>

f(x) = x^2-10x

<em><u>The vertex form is given as:</u></em>

y = a(x-h)^2+k

<h3>where (h, k) is the vertex</h3>

Rewrite the equation in vertex form

f(x) = x^2-10x

Complete the square for  x^2-10x

Use the form ax^2+bx+c to find the values of  a, b, c

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Consider the vertex form of a parabola

a(x+d)^2+e

Substitute the values of a and b into the following formula to find "d" :

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Find the value of "e" using the formula,

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y = (x-5)^2-25

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y = a(x-h)^2+k

y = (x-5)^2-25

We find, h = 5 and k = -25

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