Simplify and express the result in power notation with positive exponent (3^-7 ÷ 3^-9) × 3^-4

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Need full workings!!​

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Write a function rule for the table. hours worked pay 2 $16.00 4 $32.00 6 $48.00 8 $64.00 p = 16h p = 8.00h p = h + 16 h = 8.00p

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?