Answer
$(a)$ See the Red graph in the image below.
$(b)$ See the Blue graph in the image below.
$(c)$
Multiplying by $c$ means to shrink the original graph by a factor of $c$.
Division by $c$ (or multiply by a number less than $1$) means to stretch the original graph by a factor of $c$.
If we multiply or divide by negative number, we first apply reflection about $x$-axis and then the steps mentioned above.
Work Step by Step
We have a general form $x^2$ when $c=1$, that is the Black graph on the image above.
$(a)$ See the Red graph in the image above.
$(b)$ See the Blue graph in the image above.
$(c)$
Multiplying by $c$ means to shrink the original graph by a factor of $c$.
Division by $c$ (or multiply by a number less than $1$) means to stretch the original graph by a factor of $c$.
If we multiply or divide by negative number, we first apply reflection about $x$-axis and then the steps mentioned above.