(3a2)(5a3)
how to simplify this?

15a^5

Step-by-step explanation:

(3)(5) = 15

(a^2)(a^3)= a^5

He have to move 3 unit in left hand direction of -8 on number line.

Step-by-step explanation:

The Given Expression is -8 - 3.

To evaluate the Expressions using number line following steps to be followed:

Step 1:  Locate the first number or term.

Step 2: to further proceed with next number some rules to be used.

              a). if next term is positive then move in right hand direction of  

                   previous term on number line.

              b). if next term is negative then move in left hand direction of

                   previous term on number line .

Step 3: Follow step 2 till last term.

Here michale already located -8 on number line. Now he have to move 3 unit in left hand direction of -8 on number line because next term is -3. (Number line attached)