Carol has only 20p and 10p coins in her purse. She has three times as many 20p coins as 10p coins.
If Carol has £3.50 altogether, how many 20p coins does she have?

EXPLANATION PLEASE

Which system of linear inequalites is represented by the graph?

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?