A carpet store charges $20 per square yard of a carpet after an initial installation fee. A customer paid a total of $800 for 30 square yards. a. Write an equation that gives the total cost of buying and installing a carpet as a function of the area of the room (in square yards) b. Find the total cost of buying and installing 42 yards of carpet.

Two parallel lines are crossed by a transversal.what is value of x

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?