If y= 3x^3+x^2-5 and z=x^2-12 what is the value of 2 (x-z)? i need fast

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)