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3 years ago

5

Speed cell wireless offers a plan of $40 for the first 400 minutes, and an additional $0.50 for every minute over 400. Let t rep

resent the total talk time in minutes. Write a piecewise-defined function to represent the cost C(t)

1 answer:

Jlenok [28]3 years ago

6 0

Answer:

Step-by-step explanation:

c(t)=40:0≤t≤400

=40+0.50 (t-400):t≥400

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aleksandr82 [10.1K]

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Step-by-step explanation:

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3 years ago

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2 years ago

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The area of a parallelogram is 58 square inches. Its base is 8 inches. What is the height of the parallelogram?

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2 years ago

The half-life of cesium-137 is 30 years. Suppose we have a

VMariaS [17]

(a) If $y(t)$ is the mass (in mg) remaining after $t$ years, then $y(t) = y(0) e^{kt}=100e^{kt}.$

$y(30) = 100 e^{30k} = \frac{1}{2}(100) \implies e^{30k} = \frac{1}{2} \implies k = -(\ln 2) /30 \implies \\ \\
y(t) = 100e^{-(\ln 2)t/30} = 100 \cdot 2^{-t/30}$

(b) $y(100) = 100 \cdot 2^{-100/30} \approx \text{9.92 mg}$

(c)
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2 years ago