Plz will give brainliest answer and 20 !

on a piece of paper, use a protractor and a ruler to construct △abc with ab=6 cm , m∠a=80° , and m∠b=50° .

what is ac ?

3 cm

6 cm

9 cm

12 cm

Which of these triangle pairs can be mapped to each other using two reflections?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

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)