GEU6P7 The image shows quadrilateral ABCD.
y1
D
7
6
5
А.
3
С
2
1
В.
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4 5 6
7
a. Prove that quadrilateral ABCD is a square.
b. Find the perimeter of ABCD. Explain or show your reasoning.
c. Find the area of ABCD. Explain or show your reasoning.
Answer all three questions in the box below.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

answer: i don't understand. what are the options

step-by-step explanation:

answer: sorry i can't you.

step-by-step explanation: