Me asap i will give brainiest 20 points identify the reflection of the figure with vertices a (7, 8), b (−12, 19), and c (14, −21) across the line y = x. a. a (8, 7), b (−19, 12), c (14, −21) b. a (8, 7), b (12, −19), c (14, −21) c. a (7, 8), b (19, −12), c (21, −14) d. a (8, 7), b (19, −12), c (−21, 14) identify the translation of the figure with vertices l (1, −1), m (4, −3), and n (3, −5) along the vector (2, 5). l ′(3, 4), m ′(2, 6), n ′(5, 0) l ′(3, 4), m ′(6, 2), n ′(5, 0) l ′(1, 3), m ′(6, 2), n ′(0, 5) n ′(3, 4), m ′(6, 2), n ′(5, −1)

60%

step-by-step explanation: so we look at the formula un = a + (n-1)d

un is the amount of seats

n is the nth term aka row number

a is the original sequence/row number

d is the difference between each term

so in this a=22 d=6 and n can remain as n because we are simply formjng a rule

lets put these in the equation

un=22+(n-1)(6)

this is your answer to part a

however

lets double check that this is correct, we'll try putting it into the second term

un=a+(n-1)d

u2=22+(2-1)(6)

u2=22+6

u2=28

as the question said the second row has 28 seats so now we know the formula we made is correct.

as for part b

un=a+(n-1)

its asking us to find a row with 100 seats.

remember un was the amount of seata so all we do is substitute this in.

un=100 a=22 d=6

un=a+(n-1)d

100=22+(n-1)(6)

so now we simplify to find n which is the row number.

100-22=22+(n-1)(6)-22

78=(n-1)(6)

78/6=(n-1)(6)/6

13=n-1

13+1=n-1+1

14=n

so now we know that in the 14th row there is 100 seats.

hope this and that you understood! its my first time using the app or anyone out on here : p its also me to revise so a bunch! ask more questions if you dont understand ☺