Answer:
The appropriate set of hypothesis for his significance test is null hypothesis
and alternate hypothesis 
Step-by-step explanation:
Elliot read a report from a previous year saying that 6%, percent of adults in his city biked to work. He wants to test whether this proportion has changed.
At the null hypothesis we test if the proportion is still the same, that is, of 6%. So

At the alternate hypothesis, we test if the proportion has changed, that is, it is different of 6%. So

What is an appropriate set of hypotheses for his significance test?
The appropriate set of hypothesis for his significance test is null hypothesis
and alternate hypothesis 
Step-by-step explanation:
You just find the L.C.M of the two numbers which is 12. So the correct answer is 12
1) online has the lower unit price
27.25 / 5 = 5.45
32.16 / 6 = 5.3583333.... rounded it would be
5.35
2) The cost of 7 pounds would be 103.18
73.70 / 5 = 14.74 (cost of one pound)
14.74 x 7 = 103.18
3) The scarf in October costed more
13.35 / 3 = 4.45 (one scarf)
22.65 / 5 = 4.53
hope this helps
Because + and - make - which makes you left with 3-5 which equals to -2 because it gets negative.