2020.9.16 东京代人放狗

lovemma

PS: A store has a discount for widgets. After the first widget is bought, each widget comes with a discount of 0,20$.
If Mr. Arnold bought 17 widgets and paid 20,20$, what is the cost of 1 widget?
(number are different in the question)


PS: (sequence) A series of numbers is as follows:
A1: 0
A2: 1
A3: 2
Every number greater than or equal to A4 = 4An-3 + 2An-2 + An-3

What is A5?



DS: line L and line K are in the xy plane. Are they perpendicular?

1) The x intercept of line L + x intercept of line K = 0

2) Something about the y intercept of line L times and the y intercept of Line K




RC: Passage
This article contains extracts from it
https://www.livescience.com/16498-rodents-south-america.html

长丝弓

感谢分享！               

billyisfragile!

PS: (sequence) A series of numbers is as follows:
A1: 0
A2: 1
A3: 2
Every number greater than or equal to A4 = 4An-3 + 2An-2 + An-3

What is A5?

Is it a typo there?

APTX4869K

感谢分享！               

SabrinaSheng

感谢分享！