Solve for a Variable When Given the Value

n = 4

What is 3n?

n = 12

Evaluate.  $3\ +\ 12\ \div n$  

n = 5

Evaluate. 6 x 2 - n

n = 3

Evaluate.

n + 12

n = 7

Evaluate.
3 +  $n^2$  

n = 20

Evaluate.
 $4\ \times15\ \div n$  

n = 4

Evaluate
 $\left(3\ +\ n\ \right)\ -3\ \times2$  

n = 7

Evaluate.
 $\left(n\ +5\right)\ \div2$  

t = 7

Evaluate.

3 x (t - 1)

z = 7

Evaluate

35 - 2z