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math, algebra,correction & help

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directions are:
write each fraction in simplest form:
(-15x^3y^3)/(-20x^1y^4)

My answeris: (3x^2)/(4y)


THESE TWO NEXT ONES ARE THE ONES THAT I DON'T UNDERSTAND:

pROBLEM #1

DIRECTIONS: Write each expression in simplest form.

(4x-28)/(5x-35)

Problem #2
directions:
Write each expression in simplest form.

(4r^2-25s^2)/(2r^2+3rs-20s^2)

Your first answer is correct.
The expression
(4x-28)/(5x-35)
can be written
(4/5)[(x-7)/(x-7)]
The (x-7) terms cancel out, leaving you with 4/5.
In the lsst expression, factor the numerator and deominator. The numerator is (2r - 5s)(2r + 5s)
The denominator factors into
(2r - 5s)(r + 4s)
Cancel out the common factors.

when solving x^2=16, why is the answer +/-4

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