<span>A. cos(x) = cos(-x) [correct, since cos(x) is an even function]
B. Since the cosine function is even, reflection over the x-axis [y-axis] does not change the graph. [false]
C. cos(x) = -cos(x) [ false]
D. The cosine function is odd [even], so it is symmetrical across the origin. [false]</span>
Answer:
In 6 months (at the fifth month they are equal in price)
Step-by-step explanation:
Set the month as x.
Plan A's equation: 8x + 25
Plan B's equation: 12x + 5
8x + 25 < 12x + 5
Solve.
-4x < -20
x > 5
In 6 months (at the fifth month they are equal in price)
Si 1,2,4,5,8,10,16,20,40,80
9514 1404 393
Answer:
C. 3√2 units
Step-by-step explanation:
The diagonal of a square is √2 times the side length. For a square with side length 3, the diagonal is 3√2.
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If you like, you can see this using the Pythagorean theorem.
d² = s² + s² . . . . . where d is the diagonal, and s is the side
d² = 2s²
d = √(2s²) = s√2
For s=3, ...
d = 3√2
