Answer:
<h2>
45</h2>
Step-by-step explanation:

So, if the common ratio is 5 the next term is always 5 times the previous term.
<h3>9·5 = 45</h3>
Answer:
Can you show the drop down choices?
Answer:
58.33 lbs.
Step-by-step explanation:
There are already 25 lbs of alloy of copper
Of this 25 lbs, 20% is pure i.e. copper content = 25(0.5) = 5lbs.
Now available is
Copper Other metals
5 lbs 20 lbs
Let x lb of 30% copper is added.
Then new alloy will have 5+0.3x lb copper in total of 25+x lbs
Percentage pure = 
Simplify to get

Hence answer is 58.33 lbs should be added.