Answer:
Part 1) 
Part 2) 
Step-by-step explanation:
Part 1) we have
----> equation A
----> equation B
substitute equation B in equation A

Applying property of exponents



therefore

Part 2) we have
----> equation A
----> equation B
substitute equation B in equation A

Applying property of exponents



simplify

therefore

Money spent + money left over = total money
money spent + 9 = 30
We don't know the price of each shirt, so let x = price of 1 shirt.
Then, 3 shirts cost 3 times as much as x, or 3x.
She spent 3x.
3x + 9 = 30
Y=-13/2x+43/2 I hope this helped :3
Is there supposed to be a picture attached? Or is it asking simply what number "base 10 blocks" represents. If so, the answer would be 10. Not sure if that's what the question is asking though! Hope this helps :)
Answer:

Step-by-step explanation:
If the expression is 'seven less than n', we are subtracting 'seven' from 'n'.