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yulyashka [42]
3 years ago
13

Zach paid $56.50 including sales tax for a book priced at $45. What was the sales tax rate?

Mathematics
1 answer:
kondaur [170]3 years ago
3 0

Answer:

25.56% or $11.50

Step-by-step explanation:

I took it and put it in a sales tax calc.

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Solve for x and y:<br> 3/x -1/y =13/10<br> 1/x + 2/y =9/10
harkovskaia [24]

Answer:

  (x, y) = (2, 5)

Step-by-step explanation:

I find it easier to solve equations like this by solving for x' = 1/x and y' = 1/y. The equations then become ...

  3x' -y' = 13/10

  x' +2y' = 9/10

Adding twice the first equation to the second, we get ...

  2(3x' -y') +(x' +2y') = 2(13/10) +(9/10)

  7x' = 35/10 . . . . . . simplify

  x' = 5/10 = 1/2 . . . . divide by 7

Using the first equation to find y', we have ...

  y' = 3x' -13/10 = 3(5/10) -13/10 = 2/10 = 1/5

So, the solution is ...

  x = 1/x' = 1/(1/2) = 2

  y = 1/y' = 1/(1/5) = 5

  (x, y) = (2, 5)

_____

The attached graph shows the original equations. There are two points of intersection of the curves, one at (0, 0). Of course, both equations are undefined at that point, so each graph will have a "hole" there.

3 0
3 years ago
What is 4 1/2 pint to quart?
Ivanshal [37]

There are two pints every quarter.

So let's convert pints to quarter

   \frac{4\frac{1}{2} }{2} =\frac{\frac{9}{2} }{2} = \frac{9}{4}

There 4 1/2 pint is to 9/4 quarter.

Hope that helps!

p.s. look at my diagram to help you remember

5 0
2 years ago
4. If Sean has about 130 pieces of candy, what
Lerok [7]

Answer:

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Step-by-step explanation:EXPLAIN

EXAMPLE

6 0
2 years ago
Find x and y. Give reasons to justify your solution. AB, CD, EF, and GH are straight lines.
8_murik_8 [283]

Answer:

X= 32 Y= 35

Step-by-step explanation:

We know FOB is parralel to AOE meaning x= 32

also, COH = 90 so GOD is also 90.

a straight angle is 180, so

23+90+x or 32= 145,

180-145=35,

y=35

6 0
3 years ago
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What formula do you use to find the area of a pyramid
dedylja [7]

Answer and Step-by-step explanation:

To find the surface area of a pyramid, start by multiplying the perimeter of the pyramid by its slant height. Then, divide that number by 2. Finally, add the number you get to the area of the pyramid's base to find the surface area.

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