Rick,
These questions are all very similar. They are all about straight lines on a graph of form
y = m x + b
where m is the slope and b is the y intercept (the value of y when x = 0)
I will show you how to do one of them. Then you do the rest.
[ I was going to do #3 but you have a typo in the 1970 time ]
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.
cost = .6 x + 3.79
too easy
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.
2002-1990 = 12 years after 1990
A = .233(12) + 5.87
= 2.676+5.87
=8.546
b. In what year was the median age of cars 7.734 yr?
7.734 = .233 t +5.87
solve for t
add t to 1990
Totally lost on this. Any help would be awesome!
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.
1970 4.68
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.
1 answer
1 answer