Answer
B is the correct answer.
Step-by-step explanation:
This is the given information for which system of equations would be used to find out how many dimes and quarters Amir has?
x = dimes x = 0.10 or 0.1
y = quarters y = 0.25
31 coins
worth $5.20 = 5.2
x + y = 31
0.1x + 0.25y = 5.2
Answer:
Scale Factor
Step-by-step explanation:
The Scale Factor is referred to the ratio between any two corresponding lengths in two similar geometric figures
Answer:
25,000
Step-by-step explanation:
Because 40% = .4 * 62,500 = 25,000
Answer:
The halflife of goo is 12 minutes
Step-by-step explanation:
Use formula
![A=A_0\cdot \left(\dfrac{1}{2}\right)^{\frac{t}{k}}](https://tex.z-dn.net/?f=A%3DA_0%5Ccdot%20%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5E%7B%5Cfrac%7Bt%7D%7Bk%7D%7D)
In your case,
![A_0=292\\ \\A=9.125\\ \\t=60](https://tex.z-dn.net/?f=A_0%3D292%5C%5C%20%5C%5CA%3D9.125%5C%5C%20%5C%5Ct%3D60)
Find k:
![9.125=292\cdot\left(\dfrac{1}{2}\right)^{\frac{60}{k}}\\ \\ \left(\dfrac{1}{2}\right)^{\frac{60}{k}}=\dfrac{9.125}{292}\\ \\ \left(\dfrac{1}{2}\right)^{\frac{60}{k}}=0.03125\\ \\ \left(\dfrac{1}{2}\right)^{\frac{60}{k}}=\dfrac{1}{32}\\ \\ \left(\dfrac{1}{2}\right)^{\frac{60}{k}}= \left(\dfrac{1}{2}\right)^{5}\\ \\\dfrac{60}{k}=5\\ \\5k=60\\ \\k=12](https://tex.z-dn.net/?f=9.125%3D292%5Ccdot%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5E%7B%5Cfrac%7B60%7D%7Bk%7D%7D%5C%5C%20%5C%5C%20%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5E%7B%5Cfrac%7B60%7D%7Bk%7D%7D%3D%5Cdfrac%7B9.125%7D%7B292%7D%5C%5C%20%5C%5C%20%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5E%7B%5Cfrac%7B60%7D%7Bk%7D%7D%3D0.03125%5C%5C%20%5C%5C%20%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5E%7B%5Cfrac%7B60%7D%7Bk%7D%7D%3D%5Cdfrac%7B1%7D%7B32%7D%5C%5C%20%5C%5C%20%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5E%7B%5Cfrac%7B60%7D%7Bk%7D%7D%3D%20%5Cleft%28%5Cdfrac%7B1%7D%7B2%7D%5Cright%29%5E%7B5%7D%5C%5C%20%5C%5C%5Cdfrac%7B60%7D%7Bk%7D%3D5%5C%5C%20%5C%5C5k%3D60%5C%5C%20%5C%5Ck%3D12)
The halflife of goo is 12 minutes
Answer:
It's A
Step-by-step explanation: