Help me work these right please, I'm totally lost?

Sorry, copy paste didn't go through :

1. The function :

A(t)= 0.233t + 5.87



can be used to estimate the median age of cars in the United States t years after 1990. (In this context, we mean that if the median age of cars is 3 yr, then half the cars are older than 3 yr and half are younger.) Show your work and explain your answer.

a. Find the median age of cars in 2002.
b. In what year was the median age of cars 7.734 yr?

2. Homespun Jellies charges $2.49 for each jar of preserves. Shipping charges are $3.75 for handling, plus $0.60 per jar. Find a linear function for determining the cost of buying and shipping x jars of preserves. Show your work and explain your answer.

3. The table below shows data regarding the world indoor records in the men’s 400-m run. :

Year Records in 400m ru(in sec)
1970 46.8
2004 44.63

a. Use the two data points to find a linear function that fits the data. Let the number of years since 1970 and the world record x years from 1970. Show your work and explain your answer.
b. Use the function to estimate the world record in the men’s 400-m run in 2008 and in 2010. Show your work and explain your answer.

4. Find an equation of the line containing the given pair of points: (-2 ,3) and
(-4, 6). Show your work.

2. Cost=2.49X + .6X +3.75=3.09X +3.75

X=Number of jars purchased. 3.75=Handling charges=constant.

4. GIVEN: (-2,3), (-4,6)
Slope=m=(Y2-Y1)/(X2-X1)=(3-6)/(-2-(-4))=-3/2, Y=mX+b,3=-3/2(-2)+b,b=0,Y=-3/2X
b=Y-intercept.

(k - 4)(k + 9) - (k - 3)(k +7)

(2/3,4/6) and (-1/3,5/6)

Of course, I'd be happy to help you. Can you please provide me with some more details about what you are specifically looking for assistance with?