Bjork larsen was trying to decide whether to use a newracing wax for cross-country skis. he decided that the wax would beworth the price if he could average less than 55 seconds on acourse he knew well, so he planned to test the wax by racing on thecourse 8 times. a) suppose that he eventually decides not to buy the wax, butit really would lower his average time to below 55 seconds. whatkind of error would he have made? b) his 8 race times were 53.3, 65.9, 50.2, 52.4, 46.5, 57.8,52.2, and 43.2 seconds. should he buy the wax? explain.

4 candies

step-by-step explanation:

7 x 28 = 196

200 - 196 = 4 candies remaining.

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 ☺