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Популярное Word Problems >

The battery life of a certain cell phone starts at 8 hours. The battery life decreases at an annual rate of 30%.a. Write a function that represents the battery life y after x years.

Решение

T h e ba tt ery l i f e o f a cer t ain ce ll p h o n e s t a r t s a t 8 h o u rs . T h e ba tt ery l i f e d ecre a ses a t an ann u a l r a t e o f 30%. a . W r i t e a f u n c t i o n t ha t re p rese n t s t h e ba tt ery l i f e y a f t er x ye a rs .

Решение

Amount before reduction : 11.42857 \dots

Шаги решения

Translate the problem into an equation:

8 = x - 0.3 x

8 = x - 0.3 x : x = \frac{80}{7}

\frac{80}{7} = 11.42857 \dots

Amount before reduction : 11.42857 \dots

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