Sally read 3.25 and her brother read 1.75 non fiction
they all read 5 non fiction books all together
(a) If <em>f(x)</em> is to be a proper density function, then its integral over the given support must evaulate to 1:

For the integral, substitute <em>u</em> = <em>x</em> ² and d<em>u</em> = 2<em>x</em> d<em>x</em>. Then as <em>x</em> → 0, <em>u</em> → 0; as <em>x</em> → ∞, <em>u</em> → ∞:

which reduces to
<em>c</em> / 2 (0 + 1) = 1 → <em>c</em> = 2
(b) Find the probability P(1 < <em>X </em>< 3) by integrating the density function over [1, 3] (I'll omit the steps because it's the same process as in (a)):

Answer:
a
Step-by-step explanation:
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Answer:
216 cubic ft
Step-by-step explanation:
13
144
96
24
64
64
16
216
Oh how I miss the days when math was as simple as 2+2=4.
Educated guess here: By putting parentheses.