School and Work

1. sqrt of 18/64
2. simplified form of 4 sqrt 8/sqrt 2
3. 2 sqrt 3/25
4. simplest form of sqrt 6/5 sqrt 3

Help me please :'(

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-A hockey rink, outside its five face-off circles, each with a radius of 15 ft?

-In New York Giants’ football stadium, the grass surface is 433 ft long and 269 ft wide. What is the area of the grass surface outside the playing field?

Extra Infor to help for the first one:
Hockey Rink Has an area of 1700

Thank you if you can help :)
Folumas would help also :)

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you find the molecular formula of Fe203 (24x2 + 16 x 3=100)

you then divide 374 by 100= 3.74

since there are 3 times as many H20's you must multiply 3.74 by 3

3.74 x 3=11.22 moles

you then work out the molecular formula of H2O (1+1+16=18)

you then multiply 11.22 by 18 to get 201.96

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