Answer:
9 blue marbles
Step-by-step explanation:
4 : 3 ratio
12 : x
12 / 4 = 3
4 × 3 : 3 × 3
12 : 9
Sorry do know that one !!☹️
If it decreases by 80٪, then only 20٪ remains.
15×20٪=15×20/100=15×0.2=3
Answer: 3
value of x is: x= i and x= -i
Step-by-step explanation:
We need to find the value of x from
using quadratic formula.
The term is: 
The quadratic formula is:

Where a = 1, b=0,c=1
Putting values:

So, value of x is: x= i and x= -i
Keywords: Quadratic formula
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It's not true unless my math is wrong