I use math-a-way it answers questions like that
Answer:
GCF is 2
Step-by-step explanation:
Factoring 34 leaves only 2 and 17.
90 is not divisible by 17 thus the GCF is 2.
Rocky because of the product rule which says that when multiplying two terms with the same base you add the exponents.
In my opinion i dont think a bar model would be a good way of converting miles into feet because some might will get confused with a bar model and sometimes doesn't get you the accurate answer