How fast is decreasing

The overall incidence of false-positive smears was 0. Thus, for each true-positive result, one false-positive result was obtained. Patients in the true-positive group had clinical and radiological evidence to support the diagnosis of tuberculosis, while those in the false-positive group had new findings of the disease. These data suggest that the smear is a poor screening technique in a population where the prevalence of tuberculosis is low. Abstract The ability of any screening test to correctly identify diseased patients is directly related to the prevalence of the disease in question.

If a man 2m tall walks from the spotlight toward the building at a speed of 1. How do you solve this word problem. I have drawn a picture to figure out the solution but I have failed to come up with anything. As was aptly noted in the comments section, you can easily find the function for the length of the man's shadow cast on the wall by using similar triangles:.

Then, the function for the rate at which the length of the shadow on the wall is decreasing is going to be this:. And this is how fast the length of his shadow on the wall is decreasing when he is 4 meters aways from the building:.

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How fast is the length of his shadow on the building decreasing when he is 4 m from the building Ask Question. Asked 2 years, 8 months ago. Active 2 years, 8 months ago.

Viewed times. Please help. James Warthington James Warthington 3, 7 7 silver badges 18 18 bronze badges. Add a comment. Active Oldest Votes.