Apply the commutative property to 13 x 7 x 21 to rearrange the terms and still get the same solution.
a. 13 + 7 + 21
b. (13 x 7) x 21
c. 12 x (7 x 21)
d. 21 x 7 x 13

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

a triangle is base times height divided by two. so multiply 7.9 and 5 and then divide it by 2 to get 19.75inches.

the kite can be split into two separate triangles and added together to get the total area. 30 x 4 /2 which equals 60. make sure to double it for the two triangles making 120.