A hardware store is offering 20 light bulbs at a total cost of $71.02, which includes a 6% sales tax. To prepare for a lab experiment, Brad is making a solution that uses two types of concentrations: 75 mL of 50% salt and 125 mL of 10% salt.

What is the salt concentration of the mixed solution?
Before taxes, how much did a single light bulb cost?

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

Alake near the arctic circle is covered by a 222-meter-thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. after 333 weeks, the sheet is only 1.251.251, point, 25 meters thick. let s(t)s(t)s, left parenthesis, t, right parenthesis denote the ice sheet's thickness sss (measured in meters) as a function of time ttt (measured in weeks).

Which is the focus of a parabola with equation y2=4x