Answer:
b & d
Step-by-step explanation:
You can cross multiply and the answer would be 100/9
9/10=10/k
100=9k
k=100/9
Answer:
The third bubble. 2x=6
Step-by-step explanation:
This one because natural numbers are whole numbers and the others require negative or fractioned numbers. This one, x is equal to 3 because 2x3=6.