Aball is thrown into the air from a height of 9cm above the ground, and its height is given by s=128+32t-16t^2, where t is the time in seconds
1) find the values of t that makes s=0.
2) do both of the values of t have meaning for this application? explain why

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

If 25% of y is 30, what is 60% of y?

The square root of 9x plus 7 plus the square rot of 2x equall to 7