Greg is opening a car wash. he estimates his cost equation as c = 9000 + 0.09x and his revenue equation as r = 1.85x, where x is the number of cars washed in a six-month period. find the number of cars that must be washed in a six-month period for greg to make a profit.

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

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

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.