exam Maths Puzzle Numerical Ability

How many even positive integers are less than 42?

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exam Other Question

For every meter a diver descends below the surface of the water, the light intensity is reduced by 4%. If the intensity of the light at the surface is measured at 100%, what percen does anyone know how to find the exact value of cos 105 degrees without using tables or a calculator. please show work i dont understand how to do this.