When I try to do it on my TI84 I got an error. Can I get some help please?

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- Sep 25th 2012, 06:37 PMPast45How do you calculate this?
When I try to do it on my TI84 I got an error. Can I get some help please?

- Sep 25th 2012, 06:45 PMMarkFLRe: How do you calculate this?
I get 87.4...on my TI-89 I entered:

100+(-.84*15) [ENTER]

87.4 (result) - Sep 25th 2012, 06:48 PMPast45Re: How do you calculate this?
- Sep 25th 2012, 07:02 PMMarkFLRe: How do you calculate this?
Are you getting a syntax error? You may be using the minus key instead of the negate key in front of the .84.

- Sep 25th 2012, 07:17 PMPast45Re: How do you calculate this?
- Sep 25th 2012, 07:22 PMMarkFLRe: How do you calculate this?
Use the negate key...on my TI-89 it is to the left of the enter key, and is marked with (-). You use this to negate a number, whereas the minus key is used for subtraction. Try this and let me know if this works.