In PEMDAS, Which of the following goes first?

 $5^2$  
Which one is the exponent?

When you multiply a negative number and another negative number you get a ______

 $3.5\ \div0.5\ \cdot0.2$  

 $\frac{2}{5}+\frac{1}{3}\cdot\frac{2}{10}$  
Solve and put in simplest form.

 $\left(3-6\div2\right)-5$