x = -21
explanation: a trick i used was just do -3 times 7 and get my answer -21. if you are unsure if the answer is right just check your work with a calculator. -21 divided by 7 is -3 so -21 is the value of x. please mark brainliest !!
She would have paid 1,575 dollars plus the 800 down payment. The total would be $2,375.
Answer:
The mean is 
Step-by-step explanation:
Let x be the no. of seconds it takes for the balloons to be at the same height.
7+3x = 12+2x
Deduct both sides by 2x.
7+x = 12
Deduct both sides by 7.
x = 5
Ans: It will take 5 seconds for the balloons to be at the same height.
Here's what I did and I checked it So it is correct!!


25% is your answer.

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I hope that helps you!! Any more questions please feel free to ask!!