Kate can run 5 blocks per minute she wants to run 80 blocks how long will it take her to finish if she has already run 20 blocks
2 answers:
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It is known
and
(if you want to determine cosine of 30° you should draw the perpendicular line to the x-axis and find the point of intersection, the value of x-coordinate is the cosine of 30°).
The angle
and
(see image).
The angle
and
(see image).
The angle
The angle