Based on the picture alone, determine if each statement is true or false: justify your statement. i have already answered a few but if you could give me on the ones i don't have that would be amazing and if you can give me feed back on the ones i did do just to make sure they are right.

4: <BEC and <ECB are supplementary.

False, <BEC and <ECB are angles of triangle BCE and sum of two angles of a triangle can't be equal to 180 ( two angles of a triangle can't be supplementary).

5: C is the midpoint of BD.

False: It's not given C is the mid-point. So, we can't assume C is a mid point.

6: <BCE and < ECD are a linear pair.

True, because <BCE and < ECD are two angles on a common point on a line.

7: <ABE and <EBC are complementary.

True, because <ABC is a right angle and <ABE + <EBC = <ABC.

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 ☺