de

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Beliebt 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.

Lösung

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 .

Lösung

Amount before reduction : 11.42857 \dots

Schritte zur Lösung

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

Beliebte Beispiele

if you borrow\$1,040 for 5 years at an annual interest rate of 4% what is the total amount of money you will pay back When Christian and Cynthia were married, Cynthia was two years younger than Christian. How old was Christian on his wedding day if 20 years ago he was twice as old as Cynthia Chris is twice as old as Don. Next year, the sum of their ages will be four times as much as Don's age last year. Find their present ages.A mother is currently 7 times older than her son. In 3 years time, she will be 5 times older than her son.Twenty is the product of 4 and a number