Answer:
The alternative hypothesis is
.
The critical value is 
Step-by-step explanation:
It is claimed that proportion in favor of proportion A is greater than 60%.
This means that at the null hypothesis, we test if the proportion is of at most 60%, that is:

At the alternative hypothesis, we test if the proportion is more than 60%, that is:

What is (are) the critical value?
The critical value is the value of Z with a p-value 1 subtracted by the standard significance level of 0.05, since we are testing if the mean is more than a value, so, looking at the z-table, 
Answer:
13
Step-by-step explanation:
(17+9)/2 = 13
12 of $20 and 3 of $50 totally didnt edit it... lolol..
Answer:
Answer C = PR =8 SR =6
Step-by-step explanation:
PR = x-1
PR = 9-1 = 8
PR x = 8
SR = x-3
SR = 9-3 = 6
SR x = 6
She saves £400
She spends £640