Nigel is going from London, UK, to Moscow, Russia, by train. He goes 517 kilometers on a train from London to Paris, France. He takes another train 837 kilometer to Munich
Germany, and switches trains in Munich to ride 399 kilometers on a train to Vienna,
Austria. His last train ride carries him 2,088 kilometers from Vienna to Moscow
Find his total distance by first rounding each distance to the nearest hundred kilometers
before adding

Step-by-step explanation:

1) List out all distances singly, before rounding off.

i) From London to Paris → 517Km

ii) From Paris to Munich → 837Km

iii) From Munich to Vienna → 399Km

iv) From Vienna to Moscow → 2,088Km

2) Estimating the distances singly on the basis of rounding off to the nearest 100.

i) 517Km ≈ 500Km to the nearest 100

ii) 837Km ≈ 800Km to the nearest 100

iii) 399Km ≈ 400Km to the nearest 100

iv) 2,088Km ≈ 2,100Km to the nearest 100

3) Summing all estimated distances.

500 + 800 + 400 + 2100

= 3,800Km.

NB: when a number is equal or above 50, you are to round it off as 100; when the number is below 50, you are to round off as zero (0).

step-by-step explanation:

this is not possible to solve with the info given.   you need at least an one angle somewhere.

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15