A scientist recorded the amount of substance Z present in an ongoing chemical reaction. This table gives the amount of substance Z over the first 15 minutes. The data can be modeled using an exponential function. Time (min) 3 6 9 12 15
Substance Z (g) 6.2 3.84 2.38 1.48 0.92

Based on the data, which measurement is closest to the amount of substance Z that will be present after 30 minutes?

0 g
0.08 g
0.14 g
0.46 g

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)

Leonardo wrote an equation that has an infinite number of solutions. one of the terms in leonardo’s equation is missing, as shown below.

Find the measure of angle c in the following triangle.