Answer:
Step 2
Step-by-step explanation:
Distributive Property: ![a(b+c)=ab+ac](https://tex.z-dn.net/?f=a%28b%2Bc%29%3Dab%2Bac)
Isaac's Steps are outlined below:
![\text{Step 1:} (4.2)(-5.4) = (-5.4)(4.2) \\\\\text{Step 2:} = (-5.4)(4) + (-5.4)(0.2) \\\\\text{Step 3:} = (-21.6) + (-1.08) \\\\\text{Step 4:} = -22.68](https://tex.z-dn.net/?f=%5Ctext%7BStep%201%3A%7D%20%284.2%29%28-5.4%29%20%3D%20%28-5.4%29%284.2%29%20%5C%5C%5C%5C%5Ctext%7BStep%202%3A%7D%20%3D%20%28-5.4%29%284%29%20%2B%20%28-5.4%29%280.2%29%20%5C%5C%5C%5C%5Ctext%7BStep%203%3A%7D%20%3D%20%28-21.6%29%20%2B%20%28-1.08%29%20%5C%5C%5C%5C%5Ctext%7BStep%204%3A%7D%20%3D%20-22.68)
We observe that in Step 2:
![(-5.4)(4.2)=(-5.4)(4+0.2)=(-5.4)(4) + (-5.4)(0.2)](https://tex.z-dn.net/?f=%28-5.4%29%284.2%29%3D%28-5.4%29%284%2B0.2%29%3D%28-5.4%29%284%29%20%2B%20%28-5.4%29%280.2%29)
Therefore, Isaac applied the distributive property in Step 2.
Answer: $2400
Step-by-step explanation:
Given
Interest earned is $450
The rate of interest is R=7.5%
Time period T=2.5 years
Simple Interest is given by
![S.I.=\dfrac{P\times R\timesT}{100}\quad [\text{P=Principal}]](https://tex.z-dn.net/?f=S.I.%3D%5Cdfrac%7BP%5Ctimes%20R%5CtimesT%7D%7B100%7D%5Cquad%20%5B%5Ctext%7BP%3DPrincipal%7D%5D)
Substitute values
![450=\dfrac{P\times 7.5\times2.5}{100}\\\\P=\dfrac{450\times 100}{7.5\times 2.5}=\$2400](https://tex.z-dn.net/?f=450%3D%5Cdfrac%7BP%5Ctimes%207.5%5Ctimes2.5%7D%7B100%7D%5C%5C%5C%5CP%3D%5Cdfrac%7B450%5Ctimes%20100%7D%7B7.5%5Ctimes%202.5%7D%3D%5C%242400)
Wouldn't it be 4 because the question says 4 marbles are left over each time.
I believe the answer is 311.157055138. That is if i did my math correctly. I hope this helps. Good luck!