Step-by-step explanation:
Recall that

Therefore,

so


If the Diameter Is 4 inches then the radius will be 2 inches!
Hope I Helped!
Answer:
No, you don't.
Step-by-step explanation:
The denominator only changes if you're multiplying/dividing. You may need to create an <em>equivalent fraction</em> to add the fractions together, but you <em>don't</em> add or subtract the denominator.
Hope this helps! Have a great day!
Answer:
all except the last one
Step-by-step explanation: