On the top of a cliff, the farthest distance that can be seen on the surface of the earth is 60mi. How high is the cliff if the radius of the earth is taken to be 4000mi

An environmental engineer wants to evaluate three different methods for disposing of nonhazardous chemical waste: land application, fluidized-bed incineration, and private disposal contract. Use the estimates below to help her determine which has the least cost at /= 15.00% per year on the basis of an annual worth evaluation. First Cost AOC per Year Salvage Value Life Land $-145000 $-86000 $23000 4 years Incineration $-760000 $-70000 $260000 6 years Contract O $-132000 O 2 years

An 8.0 foot tall stop sign casts a shadow 2.7 feet long on level ground. At the same time a nearby building casts a shadow 18.6 feet long on level ground. Use similar triangle properties to estimate the height of the apartment building

a vertical 1-meter stick casts a shadow of 0.4 meters. if a tree casts a shadow of 12 meters at the same time, how tall is the tree?