Many scientific theories that are mentioned in the novel have been applied in real life. For example, Galvani proved that stimulation of a frog's nerve causes contraction of the muscle to which it is attached. This was proven in 1791. Because of this discovery, there was extensive research and excitement throughout the European nation on the application of electricity to sustain human life.
The narrator of the White Umbrella is ashamed because her mother has recently taken a job to help support their family. The moral of this story is never be ashamed of who you are.
You could rewrite it a multitude of differing ways, but I’ll resort to not changing or adding a single word.
I have a dog, its name is Labrador. He is black in color. He wags his tail and licks my face when he is happy. I tell him, “Come, Labrador!” Sometimes he screams at me, “Gwaau!” He loves going for walks and chasing a red ball. I take him to school sometimes. Once he sees a black cat he wants to chase it, but I don’t let him. He is mad at me. I don’t know, but I hope he isn’t. I love my dog very much because he always obeys me and follows me everywhere.
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The answer to your question is the third, fifth, and eighth sentence.
72=8*9
8=2*2*2 or 2^3
9=3*3 or 3^2
sqrt72=2*3sqrt2=6sqrt2
