We can write an equation to solve this:
Let x represent amount of Blue Jays.
2x + x = 21
We can simplify the equation:
3x = 21
Divide both sides by 3 to isolate x variable:
x = 7
Therefore, 7 Blue Jays.
Answer: What did Jason practice making
Step-by-step explanation: Explain what Jason was making
Answer:
a= 24 cm
Step-by-step explanation:

I hope I helped you^_^
Alright first we need to get the area of the box
7.5 times 5.5 = 41.25
then how many 3/4's in 41.25?
That's all you gotta do :) good luck!!