Use the Pythagorean theorem:

Answer:
b. 600
Step-by-step explanation:
subtract money from parents from tuition
divide by months
Answer:
z = 7
Step-by-step explanation:
4z - 8 = 20
Add 8 to each side
4z - 8+8 = 20+8
4z = 28
Divide each side by 4
4z/4 = 28/4
z = 7
6 decks of cards = 60 cards
---> 60/8 = 15/2 = 7.5
7.5 cards = 0.75 decks of cards
Therefore, each student will get 0.75 decks of cards.
Answer:

Step-by-step explanation:

Vertically opposite angles : the angles opposite each other when two lines interest
So, ∠A is vertically opposite to ∠C
(Vertically opposite angles are equal)
So, 

∠B is vertically opposite to ∠D
So,
(Vertically opposite angles are equal)
So,
Hence 