Which of the following is a one-to-one function? a. y=[x] b. f(x)={5x-1: x< -2 x-9: x> (or equal to) -2 c. y= ixi d. f(x)={4: x< 0 5: 0< (or equal to)x< (or equal to)2 6: x> 2 i think it's a but i'm really not positive

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Step-by-step explanation:

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n a 30-60-90 right (special) angled triangle, the lengths are in the ratio 1:3‾√:21:3:2.

In your figure, there are three triangles of such type. Use ratios on similar triangles to calculate each length.

For example, in △BCD,BD:CD=2:1△BCD,BD:CD=2:1. Therefore BD=20BD=20