Which is the best estimate of the sum of 56.78+5.06

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.