The answer to this question is A. : )
Answer:
x = 17.1
Step-by-step explanation:
Since this is a right triangle, we can use trig functions
cos theta = adj / hyp
cos 42 = x/23
23 cos 42 = x
17.09233 =x
Rounding to 1 decimal place
x =17.1
As stated 1 mile equals to 1.6 km,
so do calculation to get the 6 km
1 mile = 1.6 km
Then try to divide the 6 km with 1 mile value in km which is 1.6 km so that we know exactly how many miles required to get 6 km

So the answer is 3.75 miles
To prove this
If 1 mile = 1.6,
Then,
3 miles = (1.6 x 3 ) which produce 4.8 km
0.75 mile = ( 0.75 x 1.6 ) equals to 1.2 km
4.8km + 1.2km = 6km , which proves that
3 miles + 0.75 mile = 6km
0.645
You just have to multiply 2.15x30