If the x value of a measurement on a chart decreases and then increases and the y value increases, then decreases and increases again is the rate of change positive or negative? the rate of change is 1 btw

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.