What does C and R stand for in ncr for a-level maths statistics?

Dados estos segmentos forma parejas de estas que estén en la proporcion

If a salesman earns $450 for every $50,000 sale, what is his commission rate?

Solve the equation 6/5y-10=-4 X=

A soccer player runs 1 5/6 miles during the first half of a match and 2 1/2 miles during the second half. How many miles does he run during the match in total?

What do you do in slope

Members of a hospital advisory committee will be selected from 5 doctors and 4 nurses. The committee must have 2 doctors and 2 nurses. How many possible combinations of doctors and nurses could be chosen for the committee?

The ratio of bluebirds to robins is 3 to 2. A. explain what this ratio means. B. the teacher asked,"if there is a total of 30 birds and robins, how many bluebirds are there?" Henry answered,"That's easy, 30divided by 3 is 10".

Allam just finished a great meal at a restaurant in Wisconsin. The sales tax in Wisconsin is 5 percent, and it is costumary to leave a of 15 percent for the server. the tip amount is calculated on the price of the meal before the tax is applied.

Farmer parson collected 1183 chicken eggs this morning. He will put them in cartons that hold a dozen eggs each. How many cartons will he fill.

What is answer to - 14r-19=303 Can you explain it for me plx