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agasfer [191]
3 years ago
12

A number added to itself equals 5 less than the number

Mathematics
1 answer:
Nastasia [14]3 years ago
4 0

Answer:

The number is -5.

Step-by-step explanation:

x+x=x-5

2x=x-5

x-2x=5

-x=5

x=-5

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The sum of three consecutive integers if the last integer is z.
lubasha [3.4K]
The last integer is z, then the other two are z-1 and z-2.
The sum is therefore
(z-2)+(z-1)+z=3z-3.
6 0
3 years ago
Town P and Town Q are 80 km apart. A train travels from P to Q at an average speed of 120 km/h, waits, and travels from Q back t
damaskus [11]

Answer:

7 minutes 48 seconds.

Step-by-step explanation:

Average speed for the whole journey is

distance / time, so

105 = (2*80)/ (t + t2)

where t is the time when it is moving and t2 is the time it stays at town Q.

Time for journey P to Q

= distance / speed

= 80 /120

= 2/3 hours,

Time for journey Q to P

= 80/110

= 8/11 hours

So t = 2/3 + 8/11

= 46/33 hours.

- and substituting in the equation for the whole journey:

160 / (46/33 + t2) = 105

105*46/33 + 105*t2 = 160

105 t2 = 160 - (105*46)/33

           = 160 - 146.364

           = 13.636

t2 = 13.636/105 = 0.1299 hours.

= 7 minutes 48 seconds.

4 0
2 years ago
Complete the table. Explain how the Output number is related to the Input number.
krok68 [10]

9514 1404 393

Answer:

  output: 24, 25, 26, 27, 28

Step-by-step explanation:

The output expression tells you that the output is 23 more than the input.

  1 + 23 = 24

  2 + 23 = 25

  3 + 23 = 26

  4 + 23 = 27

  5 + 23 = 28

The table values are ...

5 0
3 years ago
Solve the algebraic equation: 2x + 4 = -16​
lora16 [44]

Answer:

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Step-by-step explanation:

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5 0
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7 0
3 years ago
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