Interactive practice questions
Justin is looking into the details of his mobile phone plan. He knows the costs for several call lengths.
| Length of call ($t$t minutes) | $2$2 | $6$6 | $10$10 | $14$14 |
|---|---|---|---|---|
| Cost ($C$C) | $\$1.00$$1.00 | $\$2.20$$2.20 | $\$3.40$$3.40 | $\$4.60$$4.60 |
Plot the given data in the table on the number plane.
Is this relationship linear?
Yes
No
Draw the line that connects the points.
According to the graph, how much will it cost to make a $8$8-minute call?
According to the graph, what is the length of a call that costs $\$1.60$$1.60?
What is the rule that connects the cost of a call, $C$C, to the length of the call, $t$t?
There are $20$20 litres of water in a rainwater tank. It rains for a period of 24 hours and during this time, the tank fills up at a rate of $8$8 Litres per hour.
Kerry currently pays $\$50$$50 a month for her internet service. She is planning to switch to a fibre optic cable service.
The signal ratio $D$D measured in decibels of an electronic system is given by the formula $D=10\log\left(\frac{F}{I}\right)$D=10log(FI) where $F$F and $I$I are the output and input powers, measured in megawatts, MW, of the system respectively.