Answer:

Step-by-step explanation:
Given:

Required
Multiply
The above can be written as

Split the above expression

Collect like terms

Apply first law on indices



Hence,
is equivalent to 
Answer:
6(9r-7)
Step-by-step explanation:
54r–42
Both 54 and 43 can be divided by 6
54/6 =9 and 42/6 =7
6*9r - 6*7
Factor out the 6
6(9r-7)
it is going to take 18 miles in 1 hour