exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

sqare root of 0.64 =

I am not using a specific book. I am just practicing...

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Word problem #1
Need to make at least 12 heat and at least 20 radar missiles per month.
Production limits number of missiles to no more than 72 per month
Will sell the heat miss the lenght of the base of a trianle is 3 times the lenght of its altitude. find the length of the base if the area of the triangle is 54m2