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Finger [1]
2 years ago
11

PLEASE HELP!!!!!!! FOR A TEST

Mathematics
2 answers:
lutik1710 [3]2 years ago
7 0
The original price of the shirt is. 25.20


Explanation:
0.4 x 18.00= 7.20
7.20 + 18.00= 25.20
Gennadij [26K]2 years ago
7 0

Answer:

Original sales price is $30

Step-by-step explanation:

x(1 - .4) = 18

solve for x

x  =  \frac{18}{(1 - .4)}

x = 30

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Let

x---------> represent the number of miles Troy's has driven

y--------> represent the amount of gas in Troy's truck

we know that

the equation that represents the amount of gas, y, in troy' s truck after driving a certain number of miles, x is

y-y1=m*(x-x1)

where

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in this problem the slope is equal to -\frac{1}{21} \frac{gallons}{miles}

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assuming he starts with a full tank

for\ x=0\ y=30\  gal

substitute in the formula above

y-y1=m*(x-x1)\\\\ y-30=-\frac{1}{21}*(x-0)\\\\ y=-\frac{x}{21}+30

therefore

the answer is

the equation y=-\frac{x}{21}+30

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