Okay so the first one is 3 dollars each..because if you subtract 9 from 21 you will be left with 12 dollars so if he spent the money on FOUR tickets it would be 3 because 3 times 4 is 12 :)
Answer:
Option (d) is correct.
6 + 9 + 12 +15 = 
Step-by-step explanation:
Consider the given series expansion 6 + 9 + 12 +15.
since we have to write in series form of 3.
We first write each term of given series in term of 3k or 3k+3
6 can be written as 3(2) or 3(1)+3
9 can be written as 3(3) or 3(2)+3
12 can be written as 3(4) or 3(3)+3
15 can be written as 3(5) or 3(4)+3
Thus, we can write the given series as ,
or 
Since, we have options to choose.
From the given option (d) matches our result.
So, 6 + 9 + 12 +15 = 
I think the anwser would be 28
hope i was right
Answer:
7.He borrowed $1853.33
8.She received $28990.936
Step-by-step explanation:
7.Let x be the amount borrowed by Tyson
Rate of interest = 7.5%
Time = 2.5 years
Simple Interest = 347.50
Formula : 
Where SI = simple interest
P = Principal
T = Time
R = Rate of interest
Substitute the values in the formula :

Hence he borrowed $1853.33
8) Principal = 20000
Rate of interest = 9.5%
No. of compounds per year = 2
Time = 4 years
Formula : 
Where A= amount
r = Rate of interest
n = no. of compounds
t = time
Substitute the values in the formula :
So, 
A=28990.936
Hence she received $28990.936