Answer:
30.48cm; 322.061km; 127.96m; 655.738ft
Step-by-step explanation:
A) since the denominator is going from a 1 to a larger number, you can just multiply the numerator across by however much the denominator is growing. The denominator is multiplied by 12, so just multiply the 2.54 x 12 = 30.48cm
B) you can use cross multiplication here. the 200 and 1 multiply to 200 on the left, while the .621 and n multiply to .621n on the right. 200 = .621n. Divide the 200/.621 = 322.061km
C) again, since the numerator is going from 1 to a larger number, it's being multiplied by the larger number. Here, it's multiplied by 140, so you can multiply the denominator by the same number. .914 x 140 = 127.96m
D) finally, cross multiplication again. the 200 and 1 again multiply to 200 on the left, leaving .305 x n for .305n on the right. 200 = .305n. Again, divide 200/.305 = 655.738ft
