exam Maths Puzzle Numerical Ability

Beth, a recent graduate, landed a job at Inhumane Incorporated with a starting salary of $30,000 year. She is allowed to put away up to 20% of her yearly salary in the company’s re

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Could someone please help me with this problem?
Part A.. Solve A=P+Prt for P if r=0.07, t=3, A=4646.40



Part B.. Solve A=1/2h(a+b)for b if a=3.2, h=12, A=51.6

Thank you for your help!!!!!! Need help with this problem and how to solve:
(X + 6)(-2)

I think the answer is -2x + 12

please help me