Posts by winston

Total # Posts: 13

Life orientation
Pollution, poaching and threat to animals

Math
When the moon is at its zenith at a point A on earth, it is observed to be at the horizon from point B. Points A and B are 6155 mi apart and the radius of the earth is 3960mi. Estimate the distance of the moon. Thanks!

Chemistry
electromagnetic radiation of which frequency (in Hz) can be emitted by the hydrogen atom upon transition of an electron from n= 6 to n= 2 according to the bohr model.

physical science
find the mass of sodium chloride formed when 6.9g of sodium burns in a gas jar filled with chlorine gas.

Marketing
Discuss the differences and similarities between physical products and service products in relation to the following marketing strategies and activities: Product strategies Place strategies Promotion strategies Price strategies

calculus
If x2+xy=10, then when x=2, dy/dx=?

help on calculus
A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi or 12.56637061 square centimeters?

Math
estimate the sum or difference by rounding the nearest one 9.87 +4.05

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