There are 90 new houses being built. Last month, 1/6 of them were sold. This month, 1/5 of the remaining houses were sold. How many houses are left to be sold?

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?