Write a function to represent the point (x, y) rotated 90° counterclockwise about the origin.

Mathematics

1 answer:

Yuki888 [10]2 years ago

8 0

Answer:

see explanation

Step-by-step explanation:

Under a counterclockwise rotation about the origin of 90°

a point (x, y ) → (- y, x )

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Question on the picture:

Nimfa-mama [501]

Answer:

$36\ feet$

Step-by-step explanation:

Assume that the shadow of an object in this problem is proportional to the height of the object. One can form the following ratio to describe the objects in this problem,

$(height):(shadow)$

As per the given problem, a (6) foot person casts a (1.7) foot shadow. Therefore, one can form the following ratio,

$6:1.7$

It is given that there is a lighthouse that has a shadow of (10.2) feet, one is asked to find its height. Use the parameter (x) to represent the unknown; since the ratios are related, one can form a proportion to solve for(x).

$6:1.7=x:10.2$