Two buttons with smiling faces and two buttons with sad faces are in a row as shown in the picture (attached below). when you press a button the face changes, and so do the faces of the neighboring buttons. what is the minimum number of button presses needed so that only smiling faces can be seen? Note: neighboring buttons = buttons NEXT to it.

Translate this phrase into an algebraic expression. 21 more than twice goran's savings use the variable g to represent goran's savings. need to know fast.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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