katzmuzik26
New member
- Joined
- Apr 15, 2012
- Messages
- 7
We were given a practice test... and it's about functions, absolute value, and all that jazz.
I'm really stuck on a couple of problems. Correct me please if I'm wrong. anything in red i don't get...... at all.
4. How are the graphs of y=x^2 and y= (the absolute value of ) x similar? How are they different?
Ok, so I know that the absolute value of ANYTHING is the positive integer of itself, and I know that anything squared is the number times itself. They are alike because (i think) the end result will always be positive. They are different, because one does not require multiplication ???????????
6. A relation has the domain -1< x< 4 and a range of -4<y<5, and the x-value of 2 corresponds to the y-value 0.
a. Draw the graph of a function that fits this description
b. Draw the graph of a relation that fits this description but is not a function.
What the heck?! We did not go over this in class. HELP!
By the way, the < aren't necessarily <, they're supposed to have a line under them, to signify 'greater than or equal to'
8. The equation p(t)=600(1-0.087)^t describes a bacteria population where t represents time in hours.
b. how does the population change from one hour to the next?
d. Graph the equation & give the window you use. Is this relationship a function? Why or why not?
e. use your graph and the trace feature to find out how long it takes for the bacteria population to decrease to half it's original size.
Ok, I know B, I think. It decreases by 8.7% every hour. If you were to put it on your calculator, wouldn't it be y=600(1-.087)^x????
Longest post ever. Thanks for being patient with me and reading it! And thanks for any help you can give me!!!!!!!!!!!!
I'm really stuck on a couple of problems. Correct me please if I'm wrong. anything in red i don't get...... at all.
4. How are the graphs of y=x^2 and y= (the absolute value of ) x similar? How are they different?
Ok, so I know that the absolute value of ANYTHING is the positive integer of itself, and I know that anything squared is the number times itself. They are alike because (i think) the end result will always be positive. They are different, because one does not require multiplication ???????????
6. A relation has the domain -1< x< 4 and a range of -4<y<5, and the x-value of 2 corresponds to the y-value 0.
a. Draw the graph of a function that fits this description
b. Draw the graph of a relation that fits this description but is not a function.
What the heck?! We did not go over this in class. HELP!
By the way, the < aren't necessarily <, they're supposed to have a line under them, to signify 'greater than or equal to'
8. The equation p(t)=600(1-0.087)^t describes a bacteria population where t represents time in hours.
b. how does the population change from one hour to the next?
d. Graph the equation & give the window you use. Is this relationship a function? Why or why not?
e. use your graph and the trace feature to find out how long it takes for the bacteria population to decrease to half it's original size.
Ok, I know B, I think. It decreases by 8.7% every hour. If you were to put it on your calculator, wouldn't it be y=600(1-.087)^x????
Longest post ever. Thanks for being patient with me and reading it! And thanks for any help you can give me!!!!!!!!!!!!