On the attendance worksheet, in cell l5, enter an if function to determine if the percentage in cell k5 is greater than or equal to the goal in cell h18. the function should return the text goal met if true and review if false. set the reference to cell h18 as an absolute reference

You have tot do these steps:
Ribbon
1.Click cell L5. On the FORMULAS tab, in the Function Library group, clickthe Logical, and then click IF.
2.In the Function Arguments dialog box, with the insertion point in the Logical_test box, type K5>=$H$18.
3.Press TAB to select the Value_if_true box.
4.Type Goal Met.
5.Press TAB to select the Value_if_false box.
6.Type Review.
7.Click OK.

Keyboard
1.Click cell L5, and type =IF(K5>=$H$18,"Goal Met","Review") (or =if(k5>=$h$18,"Goal Met","Review") or =IF($H$18=0.8,"Goal Met","Review") or =if(k5>=.80,"Goal Met","Review") or =IF(0.80
2.Press ENTER (or TAB or CTRL+ENTER or click the Enter button to the leftof the Formula Bar).

Keyboard (2)
1.Click in the Name box, type l5 (or L5), and then press ENTER. type =if( (or =IF( or =If().
2.Click cell K5, and then type >=.
3.Click cell H18, press F4, and then type ,"Goal Met","Review".
4.Press ENTER (or TAB or CTRL+ENTER or click the Enter button to the left of the Formula Bar).

They will be angry and maybe sack you