math 115 CH 7

A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the tree?
Is this correct ?
1m=.4m
1m÷.4m =2.5m
2.5m X 5m =12.5m

asked by Debbie
  1. they probably wanted you to set up 2 similar triangles and set up a ratio.

    let the height of the tree be h m
    then h/5 = 1/.4
    cross-multiply to get .4h=5
    h=5/.4 = 12.5 m
    so the tree is 12.5 m high.

    I know you got that numerical answer but I didn't like the way you made your statements
    e.g.
    1m = .4m makes no sense, 1m cannot be .4m

    (I know this might seem petty, but to mathematicians this is just as grating as bad grammar is to an English teacher.)

    posted by Reiny

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    I have this application that I cant figure out how to work. Please help without giving me the answer. A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the
  2. Math 115

    A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the tree?
  3. Math

    A tree casts a shadow that measures 5m. At the same time,a meter stick casts a shadow that is 0.4m long. How tall is the tree?
  4. math

    A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the tree?
  5. Math

    A tree casts a shadow that measures 5m. At the same time, a meter stick casts a shadow that is o.4m long. How tall is the tree?
  6. Math

    A tree casts a shadow that measures 5 m. At the same time, a meter stick casts a shadow that is 0.4 m long. How tall is the tree?
  7. math

    A tree casts a shadow that measures 4 ft, At the same time, a yardstick casts a shadow that is 9 in long. How tall is the pole? Assuming that the light comes from the same sources (in this case, the sun), the ratio of the
  8. geomary

    in sunlight, a vertical stick 7 ft tall casts a shadow 3 ft long. At the same time a nearby tree casts a shadow 11 ft long. How tall is the tree?Round to the nearest tenth.
  9. 8 Grade Math

    At the same time that a flagpole casts a 4.5 m shadow , a meter stick casts a 1.5 m shadow. How tall is the flagpole ?
  10. math

    A pine tree casts a 12-meter shadow on level ground. The angle of elevation from the tip of the shadow to the top of the tree is 50 degrees. To the nearest tenth of a meter, what is the height of the pine tree? Explain

More Similar Questions