A cosine function has a period of 3, a maximum value of 20, and a minimum value of 0. The function is a reflection of its parent function over the x-axis.

Question

Which function could be the function described?



f(x)=10cos(3x)−10

f(x)=10cos(2π3x)+10 <my choice

f(x)=−10cos(2π3x)+10

f(x)=−10cos(3x)+10

Answer 1

There must be some typos in the above.
The correct answer is
f(x) = -10cos((2π/3)x) + 10