Answer: 4 years
Step-by-step explanation:
A(0) has to be amount at start. Assume that's 5mg
Then A(t) = 5×(0.5)^(0.25t) = 5×2^(-t/4),
(also known as 5 exp(-λ t) with λ = ln(2)/4, incidentally).
We need to such that A(t) = 2.5mg, or 2^(-t/4) is 1/2, which happens when -t/4 is -1, or t is 4.
The distance between the two is 10
ANSWER: 8/21
Step:
1. Find the GCF (Greatest Common Factor)
The two denominator which is the bottom number have to be the same ALWAYS when adding and subtracting the fraction. So to find the GCF, you keep multiplying until you see the same number, only use the bottom number to find the GCF
7: 7, 14, 21, 28
3: 3, 6, 9, 12, 15, 18, 21, 24, 27
GCF= 21
2. 5/7 -1/3
Multiple both to get 21
5/7 x 3/3 = 15/21
1/3 x 7/7 = 7/21
3. Sove
15/21 - 7/21
= 8/21
Answer:
- $5.058 USD/gal
- $60.70 USD to fill the tank
Step-by-step explanation:
You want to know the cost per gallon of gas and the cost for 12 gallons of gas when the cost per liter is $1.31 CDN and the exchange rate is $1.02 USD per CAD.
<h3>Cost per gallon</h3>
The conversion between liters and gallons is ...
1 US gallon = 3.785411784 liters (exactly)
Then the cost conversion is ...

The cost per gallon in terms of US dollars is about $5.06.
<h3>Cost per tank</h3>
The cost for 12 gallons will be ...
(12 gal)×($5.058 /gal) ≈ $60.70
It will cost you $60.70 to fill your 12 gallon tank.
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<em>Additional comment</em>
The price of gas is routinely specified to tenths of a cent, both in the US and in Canada. As of today, the cost of gas in Canada has declined to $1.864 CAD/liter. At today's exchange rate of about $0.77 USD per CAD, the equivalent price is $5.406 USD/gal.
Answer:
266,250$
Step-by-step explanation: