If the straight line having equation(p+1)x+3y-7=0 and 3x-7y+5=0 to each other ,find the value of p​

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?