Study the E

$-$

R diagram of Figure

$720.$

$$Based on this E

$-$

R diagram, answer the following questions How many PROJECTs can an employee work on

$?$

$$What is the degree of the Includes relationship? Could TOOL be modeled as an associative entity? FIGURE

$7$

$-$

$20$

$$E

$-$

R diagram for Problem al Exercise

$7$

$-$

$21.$