Answer:
810
Step-by-step explanation:
21 = 42
Decode:
Number in the tens place = 2 x 2 = 4
Number in the ones place = 1 x 2 = 2
Answer: 42
39 = 618
Decode:
Number in the tens place = 3 x 2 = 6
Number in the ones place = 9 x 2 = 18
Answer: 618
17 = 214
Decode:
Number in the tens place = 1 x 2 = 2
Number in the ones place = 7 x 2 = 14
Answer: 214
Find 45
Number in the tens place = 4 x 2 = 8
Number in the ones place = 5 x 2 = 10
Answer: 810
Answer:
Step-by-step explanation:
Sonya drops a marble while standing on a deck 
feet above the ground.
The marble falls 
feet from Sonya's hand to the deck, and then rolls and falls to the ground.
So, the ball falls feet from Sonya's hand to the deck and from the deck to the ground, in total
The second one is a perfect square trinomial
X^2+16x+64
1 liter = 1000mL
Divide 1000mL by mL per minute:
1000 / 5 = 200 minutes ( 3 hours and 20 minutes)
