Tuesday
December 10, 2013

# Posts by joel

Total # Posts: 240

precal desperate
Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

precalculus
Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)

algebra
Which is greater? 7 3/4 or 7 2/3

math
You got the answer pretty much right but a more exact answer would be 8/3 or 2 2/3. Because in decimal form it is actually 2.66666667

Calculus - Related Rates
12mm^2/hr = r2PI dr/dt So 12/2PIr mm^2/hr = dr/dt which is the same as dr/dt = 6/PIr mm^2/hr Why'd you originally say dr/dt= 12/(2r) mm/hr

Calculus - Related Rates
I'm sorry, I'm not following what you did. I get that we know dx/dt = 12mm^2/hr and we want to find dr/dt but I don't know how you linked them together as a function of r. Maybe show me more steps and how you got the derivative dr/dt. Thanks

Calculus - Related Rates
Bacteria are growing in a circular colony one bacterium thick. The bacteria are growing at a constant rate, thus making the area of the colony increase at a constant rate of 12 mm sq. per hour. Find an equation expressing the rate of change of the radius as a function of the r...

science
how do geologists determine the texture of a rock