For this case we have the following data:


So that the figure can be a rectangle, its diagonals must be equal, that is, 
In this way we have:

Clearing x we have:


Thus, x must be equal to 10 so that the figure is a rectangle.
Answer:

Option A
Answer:
0
Step-by-step explanation:
- 0 correct
- 2 incorrect
- 4 incorrect
- 8 incorrect
3 to the 2nd power would be 9… so to make it a -9 or 1/9 it would be 3 to the -2nd power
Answer:
So length of top of table is 3x-7 inches.
Step-by-step explanation:
Here we are given that the top of the table has a width that is given by 2x inches.
The area of the top is given by:

Now the top of the table is of the shape of rectangle and area of rectangle is given by:

where l is length of the table and w is width of the table.
Plugging the values of A and w in the formula we have:

Dividing by 2x,
l=3x-7 inches
So length of top of table is 3x-7 inches.