Can you please help me solve this step by step?

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16