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hjlf
3 years ago
10

A car park charges a certain rate per hour before 3 pm, and a higher rate per hour

Mathematics
1 answer:
taurus [48]3 years ago
4 0

Who's JD?   I'll guess that's money in some country.

This one requires a bit of analysis before writing the equation.  3pm is the time the price changes so

11am to 5 is 4 hours before, 2 hours after, JD18

9am to 7 is 6 hours before, 4 hours after, JD31

OK, let's call the morning rate x and the evening rate y.  

a.

Rate times hours is cost; we have to add up the morning and evening:

4x + 2y = 18

6x + 4y = 31

b.

We multiply the first equation by 2,

8x + 4y = 36

Subtract the second equation,

2x = 36 - 31 = 5

x = 5/2

2y = 18 - 4x

y = 9 - 2x = 9 - 5 = 4

Answer: Our solution is the price was JD 2.50 before 3pm and JD 4 after.

Check:  

2.5(4) + 4(2) = 18 good

2.5(6) + 4(3) = 31 good

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The city zoo has different admission prices for adults and children. When three adults and two children went to the zoo, the bil
charle [14.2K]

Answer:

The price of adult's ticket is $ 17.73     And

The price of children's ticket is $ 13.85

Step-by-step explanation:

Given as :

The Prices for adult ticket and child ticket in the city zoo is different

Let the price for adult's ticket = $ A

And The price for child's ticket = $ C

Now, according to question :

3 A + 2 C = $ 80.89        And

2 A + 3 C = $ 77.01

Now solve the both equation

So, 2 × (3 A + 2 C) = 2 × $ 80.89      And

     3 ×  (2 A + 3 C) = 3 × $ 77.01

I.e

      6 A + 4 C = $ 161.78        And

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Now, ( 6 A + 9 C ) - ( 6 A + 4 C ) = $ 231.03 -  $ 161.78  

Or,      5 C = $ 69.25

Or,         C = $ 13.85

And Put the value of C in above any eq

       6 A + 4 × ($ 13.85) = $ 161.78

Or,   6 A = $ 161.78 - $ 55.4

Or,   6 A = $ 106.38

∴         A = \frac{106.38}{6}

Or,     A = $ 17.73

Hence The price of adult's ticket is $ 17.73     And

            The price of children's ticket is $ 13.85    Answer

3 0
3 years ago
Simplify the radical expression. √45 + √20 - √5
viva [34]
√45 = √9√5 = 3√5
√20 = √4√5 = 2√5

3√5+2√5-√5=4√5

answer = 4√5
:)
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3 years ago
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ASHA 777 [7]

Answ

Step-by-step explanation:

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3 years ago
2(x+3)-2(x+1)7z=3x-1 <br>which two are possible correct first steps in solving this equation ?
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Step-by-step explanation:

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3 0
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3) Using J =
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Answer:

Diameter = 49

radius = 49/2

circumference of circle is = <em>2</em><em>π</em><em> </em><em>r</em>

<em>=</em><em>. </em><em> </em><em>2</em><em>*</em><em>2</em><em>2</em><em>/</em><em>7</em><em>*</em><em>4</em><em>9</em><em>/</em><em>2</em>

<em>=</em><em> </em><em>1</em><em>5</em><em>4</em><em> </em><em>cm</em>

<em>hope</em><em> it</em><em> helps</em>

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