Please help, time sensitive. A sound wave is modeled with the equation y=1/4cos(2π/3)θ.
a. Find the period. Explain your method.
b. Find the amplitude. Explain your method

Show all your work. Thanks in advance guys. :)

What is the standard form of -5x^2+2x^4-11+x^3+3x

Find the ratios of the corresponding sides

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.