Eliza and her mother have a combined age of 51 years. If her mother is 39 years old , how old is Eliza?

12 years old

Step-by-step explanation:

Take 51 and 39 and subtract them.

51-39=12

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.

inverse operation of addition