A notebook costs $2.50. After tax the price of the notebook goes up to $2.70. What was the
sales tax percent?

What signals you that factoring by grouping is the best method to use when factoring a problem?

I'm confused on this could anyone me and show me what i need to do to solve it.

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4