Math questions are attached below and please answer then correctly and show your work for each question.
there are 6 questions in total.

FOR 143 POINTS
AND IF YOU PUT IMPROPER ANSWER JUST TO GET THE POINTS I WILL REPORT YOU AND YOU WILL LOOSE ALL OF YOUR POINTS.

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

Which expression is the factorization of x^2+10+21

Write the equation of the circle centered at (10,-2) with radius 2.