Please help ABC or D multiple choice I’ll givebr />

B

Step-by-step explanation:

start by multiplying the 6a to each number in the other set of parenthesis.

after doing so, you end up with the numbers: and

now multiply the one to each number in the other parenthesis. you get this:

and .

then set it all next to each other: +

then combine like terms (-54a and 2a) you get:

so that is how you get B for the answer

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)

, 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