Quick solution pleasssse

Answer 1

All methods should average at the same speed because the number of loops is known at compile time.

Answer 2

A faster solution would be to run it and see.

Answer 3

Did you have a main function around it?
#include <iostream>
using namespace std;
int main() {
int v=5;
for(v=10;v<15;v=v+5)
cout<<v;
return 0;
}

Answer 4

int v=5;
for(v=10;v<15;v=v+5)
cout<<v;

Answer 5

cout ???

Answer 6

error (for)

Answer 7

error

Answer 8

compilation