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topjm [15]
3 years ago
15

"the sum of the digits of a two-digit number is 13. reversing the digits produces a number that is 9 less than the original numb

er. what is the original number?"
Mathematics
1 answer:
Ksenya-84 [330]3 years ago
6 0
Suppose the one's digit is x, the ten's digit is y. the original number is 10y+x, the reversed number is 10x+y

x+y=13
(10x+y)=(10y+x)-9 =>9y-9x=9 =>y-x=1
Add the two equation to solve: 2y=14 =>y=7
x=13-7=6
the original number is 76. 


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The coordinates of an ordered pair have opposite signs. In which quadrant(s) must the ordered pair lie? Explain.
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Alright...so the coordinates of an ordered pair have opposite signs [one sign is positive while the other is negative] so we could have an example of (-x,+y) or (+x,-y) ...that means out of the 4 quadrants these points could be in the 2nd quadrant or the 4th quadrant or corners of the graph

7 0
3 years ago
Few drivers realize that steel is used to keep the road surface flat despite the weight of buses and trucks. Steel bars, deeply
Mrrafil [7]

Answer: Is reinforced with other material

Step-by-step explanation:

The options are:

A is expensive to build.

B usually cracks under heavy weights.

C looks like any other road.

D is reinforced with other material.

The passage best supports the statement that a concrete road are reinforced with other material. According to the information given in the passage, steel plays a vital role in keeping the road surface flat.

Steel bars are embedded in concrete so that the stresses cannot crack the slab. Therefore, it indicates that concrete road is reinforced with other material.

4 0
2 years ago
Leiff goes online to buy a new video game. He finds a site that currently has a promotion of 15% off on all orders over $50. Lei
Hatshy [7]

Answer:

$119.32

Step-by-step explanation:

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Leiff pays 5.3% sales tax on the discounted price

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So we add the sales tax amount and shipping fee

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6 0
3 years ago
Read 2 more answers
What is the 15th term in the sequence using the given formula?<br><br> yn = 12n-1
Veseljchak [2.6K]

Answer:

Step-by-step explanation:

hello :

yn = 12n-1

the 15th term is :y15 when x= 15

y15 = 12(15)-1

y15 = 179

7 0
2 years ago
A hovercraft takes off from a platform. It’s height (in meters), x seconds is modeled by h(x)=-(x-11)(x+3). What is the height o
Eddi Din [679]

Answer:

The height of the hovercraft at the time of takeoff is  33  meters.

Step-by-step explanation:

Height of hovercraft  x  seconds after takeoff  =  h(x)  =  -(x - 11)(x + 3)

Height after takeoff is  =  h(0)  =  -(0 - 11)(0 + 3)  =  -(-11)(3)  =  33

So the correct answer is 33 meters. The height of the hover craft at the time of the takeoff is 33 metres.

Answer: 33  meters.

<em><u></u></em>

<em><u>Please mark brainliest</u></em>

<em><u>Hope this helps</u></em>

6 0
3 years ago
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