Cos(θ - pi) = -cos θ ¿Cuál es el proceso? What´s the process? solo pude resolver esto, I could only solve this cos θ * cos pi + sen θ * sen pi cos θ * cos pi + cos (pi/2 - pi/1) * cos ( pi/2 - θ) cos θ * cos pi + cos ( -2pi/2) * cos (pi/2 - θ) cos θ * cos pi - cos pi * cos (90° - θ) cos θ * cos (90°- θ) cos θ * ( cos 90° - cos θ) cos θ * (0 - cos θ) cos θ * - cos θ -cos θ² = - cos θ no se en que me equivoque o que me falto I don´t know what I'm wrong

what are the answear choices to the question.

step-by-step explanation:

stethere all not eveanp-by-step explanation:

16

step-by-step explanation:

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 ☺