Grade 8 Algebra: Word Problems: Functions

Name: ______________________Date: ____________Score: ____ / 8

Level 1

Write and evaluate

1. Solve:
$\text{Pizzas}$ $\text{cost}$ $\text{8}$ $\text{dollars}$ $\text{each.}$ $\text{Write}$ $\text{a}$ $\text{function}$ $\text{for}$ $\text{the}$ $\text{cost}$ $\text{of}$ $p\text{}$ $\text{pizzas.}$
2. Solve:
$\text{A}$ $\text{taxi}$ $\text{charges}$ $\text{3}$ $\text{dollars}$ $\text{plus}$ $\text{2}$ $\text{dollars}$ $\text{per}$ $\text{mile.}$ $\text{Write}$ $\text{a}$ $\text{function}$ $\text{for}$ $\text{the}$ $\text{cost}$ $\text{of}$ $m\text{}$ $\text{miles.}$
3. Solve:
$\text{A}$ $\text{candle}$ $\text{is}$ $\text{20}$ $\text{cm}$ $\text{tall}$ $\text{and}$ $\text{burns}$ $\text{2}$ $\text{cm}$ $\text{per}$ $\text{hour.}$ $\text{Write}$ $\text{a}$ $\text{function}$ $\text{for}$ $\text{its}$ $\text{height}$ $\text{after}$ $h\text{}$ $\text{hours.}$
4. Solve:
$\text{A}$ $\text{plumber}$ $\text{charges}$ $\text{40}$ $\text{dollars}$ $\text{plus}$ $\text{25}$ $\text{dollars}$ $\text{per}$ $\text{hour.}$ $\text{What}$ $\text{is}$ $\text{the}$ $\text{charge}$ $\text{for}$ $\text{3}$ $\text{hours?}$
5. Solve:
$\text{A}$ $\text{phone}$ $\text{has}$ $\text{80}$ $\text{percent}$ $\text{battery}$ $\text{and}$ $\text{loses}$ $\text{5}$ $\text{percent}$ $\text{per}$ $\text{hour.}$ $\text{What}$ $\text{is}$ $\text{the}$ $\text{battery}$ $\text{after}$ $\text{6}$ $\text{hours?}$
6. Solve:
$\text{A}$ $\text{pool}$ $\text{has}$ $\text{200}$ $\text{liters}$ $\text{and}$ $\text{fills}$ $\text{at}$ $\text{30}$ $\text{liters}$ $\text{per}$ $\text{minute.}$ $\text{How}$ $\text{much}$ $\text{water}$ $\text{is}$ $\text{in}$ $\text{it}$ $\text{after}$ $\text{4}$ $\text{minutes?}$
7. Solve:
$\text{Movie}$ $\text{tickets}$ $\text{cost}$ $\text{12}$ $\text{dollars}$ $\text{each.}$ $\text{What}$ $\text{is}$ $\text{the}$ $\text{cost}$ $\text{of}$ $\text{5}$ $\text{tickets?}$
8. Solve:
$\text{A}$ $\text{plant}$ $\text{is}$ $\text{5}$ $\text{cm}$ $\text{tall}$ $\text{and}$ $\text{grows}$ $\text{3}$ $\text{cm}$ $\text{per}$ $\text{week.}$ $\text{How}$ $\text{tall}$ $\text{is}$ $\text{it}$ $\text{after}$ $\text{7}$ $\text{weeks?}$