Evaluating Algebraic Expressions
Algebra, and more...

 1 EASY Evaluate $$x+2$$ for $$x=7$$.

 2 EASY Evaluate $$5t$$ for $$t=4$$.

 3 EASY Evaluate $$12-a$$ for $$a=-65$$.

 4 EASY Evaluate $$\frac{4}{3}g$$ for $$g=4$$.

 5 EASY Evaluate $$6v-9$$ for $$v=4$$.

 6 EASY Evaluate $$x-y$$ for $$x=15$$ and $$y=7$$.

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

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

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

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

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

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

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

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

 15 HARD Evaluate $$\frac{x^4y}{xy^3}-\frac{xy^4}{x^3y}$$ for $$x=2$$ and $$y=\frac{1}{2}$$.

 16 HARD Evaluate $$\frac{x}{y}+\frac{y}{z}+\frac{z}{x}$$ for $$x=2$$, $$y=4$$ and $$z=6$$.

 17 HARD Evaluate $$xyz-2xy+3yz-4zx+5x-6y+7z$$ for $$x=1$$, $$y=-1$$ and $$z=0$$.

 18 HARD Evaluate $$\frac{2x^2-3y^3}{x-y}$$ for $$x=6$$ and $$y=4$$.

 19 HARD Evaluate $$\frac{xy^2z^3}{xy^3z^5}$$ for $$x=9$$, $$y=4$$ and $$z=1$$.

 20 HARD Evaluate $$ab^2c+(ab)^2c^3$$ for $$a=2$$, $$b=3$$ and $$c=-1$$.