Show algebriacally that the sum of two consecutive numbers is always odd

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.

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined