Answer:
Step-by-step explanation:
What you have to do is multiply 21 by 2. it is 42. $42 dollars was the original price of the bookcase.
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Answer:

Step-by-step explanation:
Let x be the number of helium balloons they can buy
- Write it out: 35 + 3.50x = 125
- Subtract 35 from each side, so it now looks like this: 3.50x = 90
- Divide each side by 3.50 to cancel out the 3.50 next to x. It should now look like this: x =
I hope this helps!
D.) The first step is to multiply by 10. You're right!!