Answer:

Step-by-step explanation:
You can multiply on the upper and bottom part by the same number without changing the fraction so 
Answer:
a. $11.99
Step-by-step explanation:
39.98 x .3 = 11.994
Answer:
30 i think
Step-by-step explanation:
Answer:
Ratio is 9
Step-by-step explanation:
Common ratio can be obtained by dividing second term by first term, third term by second term etc
Therefore
99/11 = 9
891/99 = 9
The common ratio is 9
Answer:
4
Step-by-step explanation:
The cardinality of a set is the number of members in the set. So besides the numbers in between the 18 and 58 you currently have 4.