Someone please help me understand this

radius=9cm

d=18 cm

Step-by-step explanation:

∅=l/r

∅=360-120=240°=240×π/180=4/3 π

4/3 π=37.68/r

r=37.68 ×3/(4π)=9.42×3/π=28.26/π ≈9 cm

d=2×9=18

4.

area of sector=πr²×∅/2π=r²∅/2

75.36=12² Ф/2=72 ∅

∅=75.36/72 =6.28/6=3.14/3≈1.0 467 radians.

l=r∅=12×3.14/3=12.56

length of arcNRP=12.56 cm

m ∠NQP=π/3 radians

i believe the answer is letter c) 8

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 ☺