What if the denominator of a fraction is twice the numerator. does the fraction is equivalent to one half?

Which speed is the fastest (use 1 mile ≈ 1.6 kilometers)? a. 12 miles/hour b. 18 feet/second c. 19 kilometers/hour d. cannot be determined

You have $600,000 saved for retirement. your account earns 5.5% interest. how much, to the nearest dollar, will you be able to pull out each month, if you want to be able to take withdrawals for 20 years?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much