Tính thể tích của khối lăng trụ đứng ABCA'B'C' , đáy tam giác ABC vuông tại A , biết AB = 2a , AC=a và độ dài cạnh bên bằng 3a

correct answer:

i^31 = -i

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol