What is the period of the sinusoid given by y=-3cos (2pi/5 x) ?

y=-3cos (2pi/5 x)

y=a cos (bx+c) + d

a=-3; b=2pi/5; c=0; and d=0

Period: P=2pi/b

P=2pi / (2pi/5)

P=2pi*[5 / (2pi) ]

P = (2pi*5) / (2pi)

P=5

Answer: T he period of the sinusoid given by y=-3cos (2pi/5 x) is 5.