Simplify using Order of Operations:

 $40+\left(72\div9\right)\div8$ 

(a)  

Simplify using Order of Opeations:

 $\left(2\cdot8\right)-9+7$ 

(a)  

Simplify using Order of Operations:

 $\left(6+2\right)\cdot\left(3+2\right)$ 

(a)  

Simplify using Order of Operations:

 $40-2^2+8$  

(a)  

Simplify using Order of Operations:

 $7\left(12-\left(6-2\right)\div4\right)$ 

(a)  

Evaluate the expression below if a = 3 and b = 4:

 $4b-5a$  

(a)  

Evaluate the expression for x = 4, y = 5, and z = 10:

 $z^2-y^2-x^2$ 

(a)  

Evaluate the expression if x = 7, y = 15, and z = 8:

 $13y-zx\div4$ 

(a)  

Evaluate the expression below if a = 3 and b = 4:

 $ab+7\cdot11$ 

(a)  

Evaluate the expression when x = 2:

 $-3x^2-5x+7$ 

(a)  

Evaluate when x = 2 and y = 5:

 $2+\left(12-5x\right)\cdot2y$ 

(a)