A number,n,is multiplied by -5/8. The product is -0.4. What is the value of n?
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if you do a quick calculation on what that angle is, you'll notice that it is exactly 1 radian, and an angle of 1 radian, has an arc that is the same length as its radius.
that's pretty much what one-radian stands for, an angle, whose arc is the same length as its radius.
The final result is: x = 4, 3.