Answer:
the correct option is choice D
7 to the 10 power would be 70
Answer:
C. 
Step-by-step explanation:
Since 40% of the students prefer chocolate ice cream, 60% don't prefer chocolate ice cream. Use this proportion set equal to 25 to find the number of students who prefer vanilla ice cream, instead of chocolate ice cream.
2+x=50
That is what I would do. I hope this helps!