PLEASE HELP FAST Part A: Find the value of c that will result in a perfect square trinomial.
x2 + 18x + c = 25 + c

Can somebody me out with this question

Which graph has a rate of change of zero

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.