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1/100,000 or 0.00001
15z² - 22z - 5 = 0 → (5z + 1)(3z - 5) = 0
5 to the power of minus 5 is equal to 1 divided by 5 to the power of 5. This simplifies to 1/ (5 x 5 x 5 x 5 x 5), which equals 1/3125 or 0.00032. This is because any number raised to a negative exponent is equal to 1 divided by that number raised to the positive exponent.
It is 20.
50 - 5/1 + 4.5 - 3 =1 - 5 + 4.5 - 3 =-2.5