3 years ago

Simplify each expression(OOF PLEASE HURRY FGHJHGFGHJ):

Mathematics

1 answer:

Svetach [21]3 years ago

6 0

(1) -(5y - 2)= -5y+2

(2) -5 (3n + 1)= -15n - 5

(3) too long to do

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Step-by-step explanation:

Let the original speed be 'x'

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$\dfrac{600}{x-200}-\dfrac{600}{x}=\dfrac{30}{60}\\\\\dfrac{x-(x-200)}{x^2-200x}=\dfrac{1}{2\times 600}\\\\\dfrac{200}{x^2-200x}=\dfrac{1}{1200}\\\\240000=x^2-200x\\\\x^2-200x-240000=0\\\\x=600,-400$

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