Find the area of the rectangle whose dimensions are 5 cm x 9 cm.

45 square cm

Step-by-step explanation:

To find the area you multiply the length by the width. 5 times 9 is 45

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

just get this app called photo math it should be able to do those