HELP! 25 POINTS! FIRST TO ANSWER СОRRЁСТLУ GETS BRAINLIEST! An expression is shown below: 4(m + 3 + 5m)

Part A: Write two expressions that are equivalent to the given expression. (5 points)

Part B: Show that one of your expressions in Part A is equivalent to the given expression using algebraic properties. Explain which properties you used. (10 points)

Part C: Show that your other expression from Part A is equivalent to the given expression by substituting a number for m. (10 points)

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t. inv.2t to find the value of t for the interval calculation.