What is the slope of the line perpendicular to the following line? 3x - 8y = 40

Nine more than four times a number is the same as one less than twice the number. find the number?

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36