How do you write 68 over 100 in decimal form

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

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Choose the more precise measurement. 26.4 cm or 8.39 cm