1) Simplify 9 - {x - (7 + x) }

2) Simplify (-5) + (-4) + (7).

3) Evaluate A^2 for A = - 3.

4) Simplify and determine the coefficient of (-1/3x) (3y) (-2x).

5) Evaluate 5x3 + 2 for x = - 1.

The answer is given above

1. 9 - { x - (7 + x) }

9 - { x - 7 - x}

9 - { - 7}

9 + 7

16 <===

2 (-5) + (-4) + 7 =

-5 - 4 + 7 =

-9 + 7 =

-2 <==

3. A^2 ... when A = - 3

(-3) ^2 =

-3 * - 3 =

9 <==

4. (-1/3x) (3y) (-2x) =

(-1/3*3*-2) (xyx) =

(-1*-2) (x^2y) =

2x^2y ... the coefficient is 2

5. 5x^3 + 2 ... when x = - 1

5 (-1^3) + 2 =

5 (-1) + 2 =

-5 + 2 =

-3 <==