Every week for
2 answers:
Answer:
The expression is :
Step-by-step explanation:
Every week for 20 weeks, Kathy earned $15 for mowing lawns and $35 for delivering newspapers.
In 20 weeks, the earnings from mowing lawns will be =
In 20 weeks, the earnings from delivering newspaper will be =
At the end of 20 weeks she spent $300 and was left with :
dollars
Or can be written as : dollars
This is the expression to solve the problem.
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Answer:
(a) 13.85 °C
Step-by-step explanation:
The temperature difference is a decaying exponential function of time. Here, it decreases from an initial difference of 15 °C to 10 °C after 25 minutes. So, that temperature difference can be modeled as ...
ΔT = 15(10/15)^(t/25)
We want to find the value of this at t=55. It is ...
ΔT = 15(2/3)^(55/25) ≈ 6.15
This is the amount the temperature of the drink is below room temperature.
drink temperature = (20 - 6.15) °C = 13.85 °C
The temperature of the drink after 55 minutes is about 13.85 °C.
