Aussie Maths & Science Teachers: Save your time with SmarterEd
and 
stand for numbers.
and are related by a rule.
What is the rule?
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`= 6 xx` `- 2` |
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`= 10 xx ` `- 10` |
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`= 2 xx` `xx` `+ 2` |
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`= 4 xx` `+ 2` |
`= 2 xx` `xx` `+ 2`
`text(Consider option 3:)`
| `10` | `=2 xx2 xx2 +2 =8+2=10` |
| `20` | `=2 xx 3xx 3 +2=18+2=20` |
| `34` | `=2 xx 4 xx 4 +2=32+2=34` |
| `52` | `=2 xx 5 xx 5 +2 = 50 + 2=52` |
`:.\ text(The rule is:)`
`= 2 xx` `xx` `+ 2`
A vet uses a rule to calculate the volume of medicine needed for a calf (baby cow).
The amount of medicine (mL) a calf needs is:
Volume for calf = (Minor dose × Age of calf) ÷ (Age of calf + 14)
Use this rule to complete the table:
A construction company uses the following rule to calculate the cost of concrete.
cost in dollars = ($59.50 × volume in cubic metres) + ($8.90 × delivery distance in km)
Jim paid the company $713 for 6 cubic metres of concrete.
What delivery distance was Jim charged for?
| km |
The table below shows the results of a rule that changes each into a .
Which rule below was used?
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`=` | |
`xx 1 + 3` |
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`=` | |
`xx 2 + 1` |
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`=` | |
`xx 3 + 3` |
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`=` | |
`xx 4 - 3` |
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`=` | |
`xx 4 – 3` |
`text(The only rule that satisfies all results is:)`
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`=` | |
`xx 4 – 3` |
Gali droppped a shot put out of a window.
He uses the following equation to calculate the height of the window in metres,
height = 4.9 x (time)²
where time is the number of seconds it takes the shot put to reach the ground.
Which of these is closest to the height of the window if it took the shot put a time of 2.4 seconds to reach the ground?
| `text(8 metres)` | `text(12 metres)` | `text(24 metres)` | `text(28 metres)` | `text(138 metres)` |
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What is the rule connecting dress sizes in Country A and Country B?
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`text(Country B = Country A – 30)` |
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`text(Country B = Country A + 30)` |
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`text{Country B = (4 × Country A) + 12}` |
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`text{Country B = (6 × Country A)}` |