Answer: 
Step-by-step explanation:

Once you take off the parenthesis, your sign should change from negative to positive.

The fractions now both have the same denominator. Thus, we can add the numerators.

Therefore, 
Answer:
D
Step-by-step explanation:
There are 1.61 km in 1 mi.
10 mi × (1.61 km/mi) = 16.1 km
Answer:
3
Step-by-step explanation:
Answer:
(6t) + (3t) + (4t)
Simplified it would be 13t
The answer is 43 hope this helps