IB MAI, Pre-test

Write as a single surd or rational number:  $3\sqrt{7\ }\ X\ 2\sqrt{7}$  

•  $6\sqrt{7}$  

• 42

• none of those

•  $5\sqrt{7}$  

 $\sqrt{80}$  

•  $5\sqrt{5}$  

•  $4\sqrt{5}$  

•  $2\sqrt{20}$  

• none of those

Write without a radical in the denominator:  $\frac{14}{\sqrt{7}}$  

•  $14\sqrt{7}$  

• none of those

• 98

•  $2\sqrt{7}$  

Express the following in scientific notation: 0.000259

• 2.59 x 10³

• 2.59 x 10^-3

• 2.59 x 10^-4

• 2.59 x 10⁴

Write as an ordinary decimal number: 2.1 x 10³

• 0.0021

• 2,100

• 21,000

• 0.021

Find correct to two decimals places: (3.42 x 10⁵) x (4.8 x 10⁴)

• 1.64 x 10¹⁰

• 16.42 x 10²⁰

• 16.42 x 10⁹

• none of those

Write in set notation:

• {x|1 < x ≥ 5}

• {x|1 ≤ x > 5}

• {x|1 < x ≤ 5}

• none of those

Write in set notation:

• none of those

• {x| x <-2 or x≥ 3}

• {x| x ≤-2 or x> 3}

• {x| x ≤-2 or x≥ 3}

Choose the right number set that correspond to the image.

• {x| -5 < x ≤4, x $\in$ N

• none of those

• {x| -5 < x ≤4, x $\in$ Z

• {x| -5 < x ≤4, x $\in$ R

Simplify if possible: 3x² + 7x³

• cannot be simplified

• 10x⁵

• 10x⁶

• 10x³