If a = 105 and a^3 = 21 × 25 × 45 × b, what is the value of b? Pick one.
A) 35 B) 42 C) 45 D) 49 E) 54
a=105 = 3* 5 *7   a^3 = 21 × 25 × 45 × b   =&gt; a^3 = (7*3) x (5*5) x ( 3^2 * 5) x b   =&gt; a^3 = 3^3 * 5^3 * 7 x b   =&gt;( 3* 5 *7) ^3 = 3^3 * 5^3 * 7 x b   b = 7^2 = 49   Answer 49
<result>D</result>
If a = 105 and a^3 = 21 × 25 × 45 × b, what is the value of b?