these are practice questions for my finals please help!!!

Carina made the following is partial table of values for the cost of natural gas. Create a cost function for Carina's natural gas bill.

c(t)=$ blank + $ blank xT

If necessary, round the basic charge to the nearest penny and unit rate charge to the nearest thousandth (three decimal places). Only enter the number. Do not enter the unit.

t	C(t)
0.0	$13.68
5.0	$17.49
10.0	$21.30
15.0	$25.11

The following is the cost function for natural gas for the city where Greg lives. Greg's natural gas bill last month was $51.54. How many therms did Greg use last month?

Round the answer to the nearest tenth of a therm (one decimal place). Only input the number. Do not input any unit. Example: 89.3

Question 103 pts

The following is a piece wise function for the electricity costs in Gretel's city of residence. Last month Gretel's electric bill was $83.06. How many kWh did Gretel use last month? Round your answer to the nearest whole kWh. Only input the number. Do not input the unit. Example: 568

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Question 112 pts

The following is a piece wise function for the water costs in Gretel's city of residence. Last month Gretel's water bill was $40.19. How many CCF did Gretel use last month?

Round your answer to the nearest tenth of a CCF (one decimal place).

Group of answer choices

7.9 CCF

2.1 CCF

8.9 CCF

11.7 CCF

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Question 122 pts

Use the following function to determine the income tax on an annual income of $67,543.21.

Round your answer to the nearest penny, Only enter the number, not the dollar sign.

Group of answer choices

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Question 132 pts

Bianca had a $2,200 simple interest CD that paid her $122.76 when it matured after 3 years. What was the annual interest rate for this simple interest CD?

Group of answer choices

1.86%

2.79%

0.0558%

5.58%

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Question 142 pts

Charlie paid $30.30 interest last month (30 days) on her credit card. What is the daily and annual interest rate if the daily interest rate is figured with 365 days in a year, and the balance that her interest was calculated from was $2,525.00

Group of answer choices

0.04% daily, 14.6% annual

0.012% daily, 14.4% annual

0.012% daily, 4.38% annual

0.0004% daily, 14.6% annual