Type quadratic equation in standard form x^2-11=4x

15x-21=5x^2

-7x^2=10-13x
​

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

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.