The value of the surface area (in square centimetres) of the cone is equal to the value of the volume (in cubic centimetres) of the cone. The formula for the surface area S of a right cone is S=πr2+πrl, where r is the radius of the base and l is the slant height. Find the height of the cone. Height:
cm

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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.

Can you me with perpendicular lines and parallel lines?

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 3 = -2x