Find the period, range, and amplitude of the cosine function. y=2/3 cos= t/2

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

What is the value of the discrimination for the quadratic equation 0=×2+2+×2

Find the least common factor denominator for these two rational 7/x^2 and 7/5x