swiftskier96 Group Title Check my work?!?!?!? 18. The sales of lawn mowers t years after a particular model is introduced is given by the function y = 5500 ln(9t + 4), where y is the number of mowers sold. How many mowers will be sold 5 years after a model is introduced? Round the answer to the nearest whole number. one year ago one year ago

1. swiftskier96 Group Title

y = 5500 In(9t + 4); t = 5 y = 5500 In[9(5) + 4] y = 5500 In(45 + 4) y = 5500 In(49) y = 5500(3.9) y = 21450

2. phi Group Title

looks pretty good, except you should not round ln(49) to 3.9 you should keep as many digits as the calculator gives you, and multiply by 5500 you will get a more accurate answer that way (and different from 21450)

3. swiftskier96 Group Title

But when i solve In(49) It is 3.9. So i should just leave the In(49) and multiply it by 5500? @phi

4. phi Group Title

you must have your calculator in fixed mode, where it is rounding the answer you can use the google search window to do calculations type in ln(49)= to see a more accurate number. that is the number you want the calculator to give you

5. phi Group Title

what happens if you type in 5500 * ln(49) in one line?

6. swiftskier96 Group Title

It doesnt give me a number. Hold on, im going to try something else...

7. swiftskier96 Group Title

I found an online calculator and it just gave me the same thing, only shorter. 3.8918202981106

8. phi Group Title

that looks good. now do 5500* 3.8918202981106

9. swiftskier96 Group Title

I got 19.459101490553. So my answer would be 19?

10. phi Group Title

5500*3.8918202981106=21405.0116

11. swiftskier96 Group Title

Oh my gosh... i did 5... wow. Ok.

12. swiftskier96 Group Title

So my final answer would be 21,405.

13. phi Group Title

so the answer is 21405 I had to look twice at your first answer 21450 (if you do 5500*3.9) which has the 5 and 0 swapped.

14. swiftskier96 Group Title

Oh ok. Alright cool! Thanks so much! :)