Saturday

April 19, 2014

April 19, 2014

Total # Posts: 10

**geometry**

findthe exact area of the region bounded by two concentric circles with a radii of 10 and 6 inches

**geomerty**

find the area of a circle circumscribed about a equalateral triangle whose side is 18 inches long

**math**

I'm assuming the question says f(x)=-x^2+5 in which case you substitute 4 in for x: f(4)=-(4)^2+5=-16+5=-11

**Math**

Integrate (sin^2(t)+1)/(cos^4(t))dt

**Math**

yes. It is a hyperbolic function with asymptotes at x = 0 and y = 0.

**5th Grade Math**

thanks for the correction the answer is 3800 otherwise that makes no sense. the question is asking for how many amphibians there are in the world and the 3400 represents 90% of all amphibians in the world. The answer can not be less then 3400 since thats not even logical.

**5th Grade Math**

3400/90% = 3777 round to nearest 100 so answer is: 3700

**chemistry**

ok and i had another question: convert the % elemental phosphorus(6.391%) to the % phosphorus present as phosphorous pentoxide (P2O5)

**Chemistry**

ok and i had another question: convert that to the % phosphorus present as phosphorous pentoxide (P2O5)

**Chemistry**

express this mass as a percentage of the weight of your sample of plant food. this is the % of elemental phosphorous in the plant food. I'm not sure what the question is asking for. The mass its referring to is 0.06438g Phosphorus and the weight of the plant food is 1.007g.

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