Algebra

NZ Level 4

Rules for describing sequences

Use the rule to complete the table of values:

"The starting number is doubled, then $4$4 is subtracted."

a

Starting Number ($N$N) |
$12$12 | $13$13 | $14$14 | $15$15 |

Answer ($A$A) |
$\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ |

b

Which of these equations describes the rule above?

$A=2\times\left(N-4\right)$`A`=2×(`N`−4)

A

$A=N\times2-4$`A`=`N`×2−4

B

$A=N^2-4$`A`=`N`2−4

C

$A=2+N-4$`A`=2+`N`−4

D

$A=2\times\left(N-4\right)$`A`=2×(`N`−4)

A

$A=N\times2-4$`A`=`N`×2−4

B

$A=N^2-4$`A`=`N`2−4

C

$A=2+N-4$`A`=2+`N`−4

D

Easy

Approx 2 minutes

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Form and solve simple linear equations