Which of the following is NOT an example of an exact number? The hexagon has 6 sides.
There are 3 wheels on a tricycle.
The desk is 84 cm long.
The table has 4 legs.

the desk is 84 cm long

Explanation:

A hexagon always have 6 sides.

A tricycle always have 3 wheels. That's why it's called tri

A tables Always have 4 legs. Well in most cases.

But a desk is not always 84 cm

The desk is 84 cm long

Explanation:

Exact numbers are either defined numbers or the result of a count

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plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

explanation: