A car purchased for $17,500. After each year the resale value decreases by 20%. What will the resale value be after 4 years? Rou
1 answer:
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<h3>Answer: Choice C. (-x, -y)</h3>
Explanation:
Focus on one point, such as A = (1,2). Note how it moves to point A ' = (-1, -2). Both x and y coordinates have been flipped from positive to negative. The rule therefore is . This describes a 180 degree rotation (either clockwise or counterclockwise, it doesn't matter). Points B and C follow the same idea.
Side note: Lines AA', BB' and CC' all go through the origin (0,0).
Answer:
1+i
Step-by-step explanation:
To find the 8th roots of unity, you have to find the trigonometric form of unity.
1. Since then
and
This gives you
Thus,
2. The 8th roots can be calculated using following formula:
Now
at k=0,
at k=1,
at k=2,
at k=3,
at k=4,
at k=5,
at k=6,
at k=7,
The 8th roots are
Option C is icncorrect.