Question 23263
<pre>can u help me solvethese 3 problems?
1.  x times 1 over y?
<b><font size = 3>
     1     x     1     1·x      x
x · ——— = ——— · ——— = —————— = ———
     y     1     y     y·1      y
</b><font size = 2>
2.what is a 16oz of bottle of water costs $1.44.what is the cost per ounce? 
<b><font size = 3>
1.44 dollars    144 cents     144   cents      cents
———————————— = ———————————  = ——— · —————— = 9 ————— = 9¢/oz
  16 ounces      16 ounces     16   ounce      ounce

</b><font size = 2>
3.Evaluate 3(x<sup>3</sup>-5x)+6for x=3?
<b><font size = 3>
     3(x<sup>3</sup> - 5x) + 6

Change the parentheses "{ }" to brackets "[ ]"

     3[x<sup>3</sup> - 5x] + 6

In place of each "x" write "<font color = "red">(3)</font>"

     3[<font color = "red">(3)</font><sup>3</sup> - 5<font color = "red">(3)</font>] + 6

<font color = "red">(3)</font><sup>3</sup> = 3·3·3 = 27 so replace the <font color = "red">(3)</font><sup>3</sup> by 27

     3[27 - 5<font color = "red">(3)</font>] + 6

5<font color = "red">(3)</font> = 15, so replace the 5<font color = "red">(3)</font> by 15

     3[27 - 15] + 6

27 - 15 = 12 so replace the 27 - 15 by 12

     3[12] + 6

3[12] = 36 so replace the 3[12] by 36

      36 + 6

36 + 6 = 42, so replace the 36 + 6 by 42

      42 

Edwin
AnlytcPhil@aol.com</pre>