Hey there, Bulgogi!
The correct answer will be the first one since [I'm assuming] you know that to calculate the percentage of something, it's the amount of that something divided by the total amount but since only 30 students voted [12+18] multiplied by 100.
So, we are calculating the percentage on votes and 12 students voted for Candidate A so our Numerator will be 12 and our Denominator will be the total amount of student who voted, so 30 [or 12+18]
Once put into a fraction, we will get

which would be equals to 2/5 or 0.4. Now we multiply by 100 and we get a total of 40% for Candidate A.
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Answer:
Prime
Step-by-step explanation:
circle
1. area=π*R square
2.circumference=2πr
sphere
1. curve surface area=4*π*R square
2. volume =4/3*π*R^3
Please find attached photograph for your answer. Hope it is alright.
The first aquarium is 2592 cubic inches
The second is 3240 cubic inches
The third is 3888 cubic inches.
So the second aquarium is the right answer.