Step 1: Remember the equation for area
l•w=a
Step 2: Substitute the length and width into that equation
4t•7t=a
Step 3: Substitute the value for “t” which in this case is 9
4(9)•7(9)=a
Step 4: Solve for area
4(9)•7(9)=a
36•63=a
99=a
Area of 99 m
Hope this helps comment below for more questions :)