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Grade 9 Math Review

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The design has rotation symmetry. Its order of rotation is

This design has rotation symmetry. The angle of rotation is _____ degrees.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Which letters have horizontal line symmetry?

B C D E H I K O X

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Which letters have vertical line symmetry?

A H I M O T U V W X Y

The expression 10⁵ x 5⁵ written with only one exponent is

(10 x 5)⁵ or 50⁵

△GHI is similar to △KLM. Determine the missing length.

On a scale diagram, what does 1 in the scale 1:5 represent?

one unit of the diagram size

An umbrella is 75 cm in length. Using a scale of 1:5, the length of an image of the umbrella is

15 cm

The constant amount by which the dimensions of an object are enlarged or reduced is called the

scale factor

How many lines of symmetry are possible for the design?

If the actual pencil has a length of 18.8 cm, determine the scale factor used to create this image. Give your answer to the nearest tenth.

0.2

An actual western spruce budworm larva can grow to 32 mm in length. Using a scale of 1:143, what would be the length of an image of the larva? Express your answer to the nearest tenth.

22.4 mm

When you combine like terms, the expression 2t² - 5 - 8t² - 4 becomes

-6t² - 9

In the monomial -q², the value of the coefficient is

-1

What is the expression, in simplest form, for the perimeter of the triangle?

7x - 2

Which equation represents the pattern?

s = 8f + 4