If a quadrilateral is a square, then all sides are the same. What part is the conclusion

Which is an equation for the nth terms of the sequence 12,15,18,21

You buy five cds at a sale for $5.95 each. write an expression for the total cost of the cds.then use the distributive property and mental math to evaluate the expression.

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.