70 = 100 - 2•15 is 2 s.d.'s below the mean.
130 = 100 + 2•15 is 2 s.d.'s above the mean.
By the empirical rule,
Pr [70 ≤ X ≤ 130] = Pr [-2 ≤ Z ≤ 2] ≈ 95%
(where Z is normally distributed with mean 0 and s.d. 1)
Answer:
7x³ + 9x² - 3x - 8
Step-by-step explanation:
4x³ + 6x² + 2x - 3 + 3x³ + 3x² - 5x - 5 ← collect like terms
= 7x³ + 9x² - 3x - 8
9.931×10×10×10×10×10=993100
Answer:
Step-by-step explanation:
f(x) + g(x) = 3x^2 + 2x - 1 + x^2 - 3x + 1
f(x) + g(x) = 4x^2 - x
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f(x) - g(x) = 3x^2 + 2x - 1 - x^2 + 3x - 1
f(x) - g(x) = 2x^2 + 5x - 2
The first equation is the inverse of
. The inverse of a function is its opposite, so that for one function, x gives y, and for its inverse, y gives x. To find an inverse, we interchange x and y in the equation and solve for y.
Answer choice A represents the inverse before it's simplified.
