Explain the term type conversion. How is implicit conversion different from explicit conversion?

In what way is static declaration different from dynamic declaration?

Predict the return data type of the following:

int p; double q;
r = p+q;
System.out.println(r);

Predict the return data type of the following:

float m;
p = m/3*(Math.pow(4,3));
System.out.println(p);