Proving or disproving a statement

Quiz by Oak National Academy: GCSE Maths Higher (2)

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Q 1/6
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Which of these statements are always true?
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Q1
Which of these statements are always true?
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30s
Q2
Which of these is a general form for any odd number (where $n$ is an integer)?
$2n+1$
$4n + 1$
$n + 1$
$2n$
$n$
30s
Q3
The diagram shows a right-angled triangle. Which of these is an expression for the area?
$ab$
$\frac{bc}{a}$
$a + b + c$
$abc$
$\frac{ab}{2}$
30s
Q4
The diagram shows a right-angled triangle. Which of these formula show the correct relationship between the lengths of the sides?
$2a + 2b = c$
$ab=c$
$\frac{ab}{2}= c$
$a + b = c$
$a^2 + b^2 = c^2$
30s
Q5
Which of these shows the first 4 numbers of the form $9^n$ where $n$ is a positive integer?
1, 9, 81, 729
9, 81, 512, 4608
9, 81, 729, 6561
9, 81, 109, 181
1, 9, 17, 26
30s
Q6
Andeep has written out the first 4 numbers of the form $9^n$ where $n$ is a positive integer. Which of these conjectures hold true for these 4 values?
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