Ms.Sue when you answered my question you said x= 3.87 but then the daughters drink would be $2.97 and the sons drink would be $5.97 not 6.07 and the total wouldnt add up to $12.90, it would add up to 12.81.... i don't get this

Here's your original question.

My family went to starbucks. We ordered 3 drinks. My daughter's drink was .90 cents less than my drink and my sons drink was $2.20 more than my drink. The total bill was $12.90. How much was each drink? Use algebra.

3.87 + 2.20 = 6.07

no it wasn't 2.20 it was 2.10

i miss typed its actuallt 2.10 not 2.20

im still stuck

Go back and do the problem the way I did -- but use the correct numbers.

ok thanks, and its totally my fault cause i miss typed the question. thank you for understanding and helping me :)

You're welcome. :-)

I apologize for the confusion in my previous response. Let's go through the calculation again to address the issue.

From the information given, we know that the cost of the son's drink (x) plus the cost of the daughter's drink (x - 0.90) adds up to a total of $12.90.

We can set up the equation as follows:

x + (x - 0.90) = 12.90

Now, we can simplify the equation:

2x - 0.90 = 12.90

Adding 0.90 to both sides of the equation:

2x = 13.80

Dividing both sides of the equation by 2:

x = 6.90

Now we have found the cost of the son's drink to be $6.90. To find the cost of the daughter's drink, we can subtract $0.90 from x:

x - 0.90 = 6.90 - 0.90 = 6.00

So, the cost of the daughter's drink is $6.00.

Now let's verify if the calculations add up correctly:

$6.90 (son's drink) + $6.00 (daughter's drink) = $12.90.

Therefore, the total sum of $12.90 confirms that the calculations are indeed correct.

I apologize again for any confusion caused in my previous response.