Exponential functions quiz: Need work.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

2. using calculations based on a perpetual inventory system, determine the inventory balance altira would report in its august 31, 2021, balance sheet and the cost of goods sold it would report in its august 2021 income statement using the average cost method. (round "average cost per unit" to 2 decimal places.)