For the school play, most of the chairs are rows of 10 each, with one row of 8 chairs. if there are 78 chairs in altogether, how many rows are there?

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

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