John (whos line of sight is 6 ft above horizontal is trying to estimate the height of a tall oak tree. he first measures the angle of elevation from where he is standing as 35 degree > he walks 30 feets closer to the tree and find s that the angle of elevation has increased by 12 degree .estimate the height of the tree.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

the correct answer is c   with the systems

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.