Sonia purchase envelopes at the cost of $3.50 each, including tax, and postcards at the cost of $1.25 each, including tax. If Sonia bought the envelopes and the postcards with a $20.00 bill and received a $2.25 change, how many postcards did Sonia buy?

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

What could explain what happened when the time was equal to 120 minutes

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a.the profit when the unit price is equal to 0b.the unit price(s) when the profit is equal to 0c.the profit when the unit price is greatestd.the unit price(s) when profit is greatest