Please I need help with that
1 answer:
The plane is P, the point of intersection is X, and the hash marks all indicate X is the midpoint of the line segments that go through x. The appropriate choice is the second one.
_____
The first choice makes no sense, as there are no right angles shown.
The third choice makes no sense, as the plane is P, not X.
The fourth choice is cut off, but is obviously incorrect, too.
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Answer:
A
Step-by-step explanation:
The velocity of a moving body is given by the equation:
Is the velocity is <em>positive </em>(v>0), then our object will be moving <em>forwards</em>.
And if the velocity is negative (v<0), then our object will be moving <em>backwards</em>.
We want to find between which interval(s) is the object moving backwards. Hence, the second condition. Therefore:
By substitution:
Solve. To do so, we can first solve for <em>t</em> and then test values. By factoring:
Zero Product Property:
Now, by testing values for t<1, 1<t<4, and t>4, we see that:
So, the (only) interval for which <em>v</em> is <0 is the second interval: 1<t<4.
Hence, our answer is A.