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Leni [432]
4 years ago
9

Starla bought cloth napkins at an outlet store for $3.50 each, and she also used a $15 off coupon. In the equation below, x repr

esents the number of napkins, and y represents the cost before tax. y = $3.50x - $15 If Starla paid $55.00 before tax, how many napkins did she buy? A. 20 B. 2 C. 16 D. 21
Mathematics
1 answer:
schepotkina [342]4 years ago
3 0

A. 20

Begin by substituting the known value. I have removed the symbols for now just to make the equation easier to read. 55 = 3.5x - 15

Add 15 on both sides of the equation to cancel out the subtraction. 70 = 3.5x

Finally, divide both sides by 3.5 to cancel out the subtraction. 20 = x

So, Starla bought 20 napkins.

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Endpoint (-10,9); midpoint (2,5)
Sergeu [11.5K]
<u>x₂ + x₁</u> = m         <u>y₂ + y₁</u> = m<u>
</u>    2                         2
<u>
</u>-10 = x₂
<u />9 = y₂

2=m
5=m

Plug in given numbers

<u>-10 + x</u> = 2                <u>9 + y</u><u /> = 5
      2                              2
Solve

<u>-10 + x</u> = 2*2
     2 *2

-10 + x = 4
+10        +10
         x = 14
(9 + y)/2(2) = 5 (2)
9 + y = 10
-9         -9
      y=1

Final Answer: (14,1)




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