A4-ft vertical post casts a 20-in shadow at the same time a nearby cell phone tower casts a 120-ft shadow. how tall is the cell phone tower?

change 20 in  to ft

20/12 = 1 2/3 ft

4 ft                               x ft

                    =    

5 /3 ft  shadow           120 ft

using cross products

4 * 120 = 5/3 x

480 = 5/3 x

multiply each side by 3/5

480 * 3/5 = x

288 ft

answer: it's d

step-by-step explanation:

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answer: d.) the total number of protons and neutrons is 15

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