Question

1.87e3 m + 24 m + 5.43e-1 km + 1.561e2 km = km

Answer 1

Answer is: 158,5 km.
1.87e3 m is 1870 m /1000 = 1,87 km.
24 m is 24 / 1000 = 0,024 km.
5.43e-1 km is 0,587 km.
1.561e2 km is 156,1 km.
summing: 1,87 km + 0,024 km + 0,587 km + 156,1 km = 158,5 km.
e3 means 10³ (10 · 10 · 10 = 1000).