12 - (-7)
I don’t know why but this is making my head spin because it’s not 5

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

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

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.