Multiply the polynomials (x+3) (2x-4). What is the product in the form ax2 + bx + c

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?