Rachel finished a meal at a diner and received a bill for $10.99. She charged the bill along with a 15 percent gratuity to her

Mathematics

1 answer:

muminat3 years ago

4 0

Answer:

so her bill was 10.99 and she added 15% for the tip, how much is 15% of 10.99?

well, if we take the 10.99 to be the 100%, let's see how much is 15% of that.10.99 + x.

Step-by-step explanation:

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iris [78.8K]

X-y=5
xy=3.36
add y to both sides on first
x=5+y
sub that in other eqation
(5+y)y=3.36
expand
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minus 3.36 both sides
y^2+5y-3.36=0
use quadratic formula

for
ay^2+by+c=0
$y= \frac{-b+/- \sqrt{b^2-4ac} }{2a}$
for 1y^2+5y-3.36
$y= \frac{-5+/- \sqrt{5^2-4(1)(-3.36)} }{2(1)}$
$y= \frac{-5+/- \sqrt{25+13.44} }{2}$
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sub back

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the numbers are either 10.6 and 5.6 or 0.6 and 5.6
wait,but 10.6 and 5.6 don't multiply to get 3.36 so that is an extrainiesous answer

answer is 0.6 and 5.6

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