HELPP: Karina ran 4 laps around a circular track with a radius of 10 m. How far did she run?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?

In δabc, m∠acb = 90°, cd ⊥ ab and m∠acd = 45°. find: a find cd, if bc = 3 in