6d + 3d - 6d - 8 - 4d = 0. Solve for the variable

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?