Log10 (x - 9) + log10 x = 1

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.