Evaluating Algebraic Expressions
Algebra, and more...

 1 MEDIUM Evaluate $$7+8b$$ for $$b=-2$$.

 2 MEDIUM Evaluate $$pq$$ for $$p=6$$ and $$q=-4$$.

 3 MEDIUM Evaluate $$3a+5b$$ for $$a=7$$ and $$b=-2$$.

 4 MEDIUM Evaluate $$\frac{d}{c}$$ for $$c=77$$ and $$d=11$$.

 5 MEDIUM Evaluate $$3ab-4a+6b$$ for $$a=3$$ and $$b=-2$$.

 6 MEDIUM Evaluate $$w^3-w^2+w-1$$ for $$w=-1$$.

 7 MEDIUM Evaluate $$5x-3y+9z-7x+6y-4z$$ for $$x=3$$, $$y=2$$ and $$z=-4$$.

 8 MEDIUM Evaluate $$xyz-2yz$$ for $$x=-2$$, $$y=-3$$ and $$z=7$$.