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anzhelika [568]
2 years ago
6

Select all expressions that are equivalent to −4(+2)−2+4

Mathematics
1 answer:
bonufazy [111]2 years ago
6 0
Not A = -10
Not B= -8
Not C= -10
I think D

I am not sure
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A train leaves at 14.54 and arrives at its destination at 15.47. If the train travelled 66 km, what was it's average speed in km
JulijaS [17]

Answer: average speed of the train = 4,483.0 km/h

Step-by-step explanation:

Speed = Distance / Time

Distance = 66 km

Time = 15.47  cancelling 15, we have 60 sec added to 47 sec

         <u> - 14.54</u>

=         14.   107    60 + 47

         <u> - 14.  54</u>

<u>                     53secs</u>

53secs to hours becomes =

60 secs = 1 min

60 min= i hour

therefore 53seconds =53/3600=0.0147222hours

Speed= 66/ 0.0147222= 4,483.025

Rounding to 1 dp becomes= 4,483.0 km/h

3 0
2 years ago
A number, x, rounded to 1 decimal place is 3.7<br>Write down the error interval for x.​
alekssr [168]

Answer:

3.65 \leqslant x \leqslant 3.75

Step-by-step explanation:

The error in rounding a number is half of the unit of measure.

The number was rounded to the nearest 0.1 unit so the error is 1/2×0.1, which equals 0.05.

Now we add 3.7 and 0.05, which equals 3.75 and we also take 3.7 - 0.05, which equals 3.65

So, the error interval is:

3.65 \leqslant x \leqslant 3.75

4 0
3 years ago
Solve 3[-x + (2 x + 1)] = x - 1.
svetoff [14.1K]

Answer:

x = -2

Step-by-step explanation:

5 0
3 years ago
If multiplying by a negative you switch the direction of the sign true or false?
MrMuchimi

Answer:

true

Step-by-step explanation:

5 0
3 years ago
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Answer:

A) 370

Explanation:
5 0
2 years ago
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