Synchronized versions of the collections in the Java Collections API allow at a time to access a collection that might be shared among several threads. Group of answer choices only one thread any number of threads a maximum of two threads None of these.

Which of the following would not be considered a pc? a. mainframe b. desktop c. tablet pc d. laptop

*! 20 points! *jeff wants to create a website with interactive and dynamic content. which programming language will he use? a. dhtml b. html c. css d. javascript

For positive constants a and b, the force between two atoms in a molecule is given f(r) = −a r2 + b r3 , where r > 0 is the distance between the atoms. note: a and b are upper case letters. (a) find f '(r) = (b) find the critical point for f(r). r = (c) find f ''(r) = (d) find the value of r so that f ''(r) = 0.