Are the third person singular action verbs and the third person plural questions preceded by do?

Are the third person singular action verbs and the third person plural questions preceded by do?

No. the third person singular uses does as the subject and the plural uses do
Do they go home every day?
Does she go home every day?

Let f (x) = 1 / 3x ^ 3-ax ^ 2-3a ^ 2-5 / 3 (a > 0)
If a = 1, find monotone interval and extremum of F (x)
2. If the equation f (x) = 0 has only one solution, find the value range of real number a

1. Negative infinity increases to 0, 0 is the maximum. F (o) is equal to three a minus five-thirds.0 to 2A minus 2a, take the minimum. F (2a) is equal to the third power of negative four-thirds a minus three a minus five-thirds.2a to positive infinity
2. To make f (x) equal to 0, there is only one solution. It only needs to satisfy that the maximum value is less than 0. But it has nothing to do with A. that is, a is greater than 0. Is your formula correct? There is no linear formula of X

What is the English phrase for the word "graduation"

finish school
after graduation
gradudte from
Please adopt it in time. If you don't know, please continue to ask (online everyday)
(*^__ ^*I wish you progress in your study! Thank you!

As shown in the figure, point I is the inner part of △ ABC, AI intersects BC with D, and the circumcircle of △ ABC intersects E

It is proved that: (1) connecting Bi, ∵ I is the heart of △ ABC, ∵ 1 = ∵ 2, ∵ 3 = ∵ 4, ∵ BIE = ∵ 1 + ∵ 3, ∵ IBE = ∵ 5 + ∵ 4, and ∵ 5 =