At a school carnival, tickets can be purchased to participate in different activities. The table shows the total cost for different numbers of tickets.
School Carnival
Number of
Tickets,
Total Cost,
(dollars)
8
2.00
12
3.00
20
5.00
30
7.50
50
12.50
What is the constant of proportionality that relates y, the total cost in dollars, to x, the
number of tickets purchased?
A 4.00
B 0.25
C 1.00
D 0.10

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

At river bank, checking account customers earn 0.75% interest a month on their account balances, pay no service fees for writing checks, and pay a monthly $2.00 financial charge. calculate the income earned in one month on the checking account for a customer with an account balance of $1,000. a. $4.25 b. $5.50 c. $6.75 d. $7.25 checking account earnings at baker’s bank are expressed by the equation: i = -0.09x + 10.2. while the earnings at elite bank are modeled by: i = -0.02x + 7.5. in both cases, x is the number of checks written. at what number of checks will elite bank start generating more checking account income than baker's bank? a. 12 b. 25 c. 39 d. 42 emilio’s checking account had a balance of 728.32 at the beginning of the week. he wrote checks for the following amounts throughout the week: $99.48, $33.50, $18.23, and $72.05. he also deposited his paycheck in the amount of $1,109.90. what is his account balance at the end of the week? a. $1,192.35 b. $1,222.86 c. $1,540.52 d. $1,614.96

This graph shows a portion of an odd function. use the graph to complete the table of values. x f(x) −2 −3 −4 −6