# Posts by North

Total # Posts: 4

**Math**

How much coffee that is $10 per pound should be added to 30 pounds of coffee at $3 per pound to get a coffee $5 per pound?

*February 17, 2014*

**math**

always true

*April 14, 2010*

**Algebra**

I'll answer the first question. The directrix is vertical so the parabola opens sideways. The equation is therefore of the form: 4p(x - h) = (y - k)^2 The directed distance from the directrix to the vertex is p. p = 6 - 1 = 5 4p = 4*5 = 20 p is positive so the parabola ...

*November 29, 2008*

**precalculus**

Let P = population in millions t = time in years Population growth is continuous. For continuous compounding use the formula: P = 65*e^(.015t) For the population in 12 years we have: P = 65*e^(.015*12) = 65*e^(.18) P = 77.8 million

*November 25, 2008*

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