Answer:
b
Step-by-step explanation:
40 + 90 =130
180-130=50
Answer:
(4/15)
Step-by-step explanation:


1- Multiply the numerators:

2- Multiply the denominators:

3- Thus:

Hope this helps ;)
Answer:
4.3 km
Step-by-step explanation:
The law of cosines can be used to find the desired distance. If we call the lighthouse position point L, then we have ...
CH² = LC² +LH² -2·LC·LH·cos(L)
CH² = 2² +2.5² -2·2·2.5·cos(143°) = 10.25 -10cos(143°) ≈ 18.2364
CH ≈ √18.2364 ≈ 4.27 . . . . km
The distance CH is about 4.3 km.