Solve: 3(2x - 5) = 6x - 15 A) 0 B) 1 C) 20 D) infinitely many solutions
2 answers:
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Much as you would like it to be D, it isn't. D has its center at (3,4). You must change the sign on both numbers inside the brackets.
You need something that looks like (x + 3)^2 + (y + 4)^2. So it could be A or B. How do you know which? The graph should give you an answer, then we'll talk about it. The red circle is A the blue circle is B. Which one is correct?
The answer to that is that the center is 5 units away from the origin. The radius of this circle is the sqrt(25) = 5 units away from the center. The blue one has a radius of sqrt(5) which is something over 2. It is not enough. So what's the answer?
We can first change 4% to a decimal by dividing by 100:
Then we can multiply this by 3.5km:
So now we know that 4% of 3.5km is 0.14km.