At 2: 30 p. m., cayson leaves his house and drives north to the stadium. he arrives at 5: 00 p. m. also leaving at 2: 30 p. m., his brother riley leaves his house and drives south to a lake. he arrives at 5: 30 p. m. the driving distance from the stadium to the lake is 385 mi. cayson and riley drove at the same speed. what was their speed?

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

28 x 12 + 34 = ? it's for a test that if i fail on i will not proceed into the honor roll society i always dreamed of!me! worth 50 !

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)