Proving the parallelogram side theorem

Combine like terms to make a simpler expression 3z+z

Which expression is equivalent to -5(3x - 6/7)

The frequency table shows the results of a survey comparing the number of beach towels sold for full price and at a discount during each of the three summer months. the store owner converts the frequency table to a conditional relative frequency table by row. which value should he use for x? round to the nearest hundredth. 0.89 0.90 0.92 0.96