True or false for all real numbers a and b, 2a • b =a^2 +b^2

The westins and the shermans live in the same city and pay the same sales tax rate, and both families made $14,000 in taxable purchases last year. if the westins made $86,000 and the shermans made $33,000 last year, is the sales tax in their city an example of a regressive tax? yes, because the westins and the shermans both paid the same sales tax rate. b. no, because the shermans paid a higher percentage of their income in sales tax than the westins did. c. no, because the westins and the shermans both paid the same sales tax rate. d. yes, because the shermans paid a higher percentage of their income in sales tax than the westins did.

Acabbage palmetto has a height of 80 feet.what is the approximate height of the tree in meters

If you bought a stock last year for a price of $124, and it has gone down 5.6% since then, how much is the stock worth now, to the nearest tenth?