PLEASE HELP ME
Factor the common factor out of each expression
2) 7b + 28b

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

Marlow is comparing the prices of two trucks rental compaines company a charges $3 per hour and an addtional $75 as serivce charges company b charges $2 per hour and an additional $85 as serivce charges

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)