A10-foot ladder is leaning against a tree. the bottom of the ladder is 4 feet away from the bottom of the tree. about how high up the tree does the top of the ladder reach?

Can someone me do math because i am having a breakdown rn because i don’t get it

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)

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.