Answer:
b=-5
Step-by-step explanation:
Divide by -9 to eliminate the -9 on -9b
(Since -9b is the same thing as -9 times b we can use the inverse of multiplication which is division to eliminate the -9 from b but we need to do it on both sides to make it balance)
-9b/-9=45/-9
b=-5
15 x 25 = 375
15 x 50 = 750
375 + 750 = 1,125
She has 1,125 books.
BC = 6 km
<u>/</u><u> </u> ACB = 34°
AC = ?
cos 34° = 
=> 0.829 = 
=> AC = 
=> AC = 7.23763570567
=> AC = 7 km
=> AC = 10 km
(nearest tenth)

<h3>Answer : 10 km</h3>

HOPE IT HELPS
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I think its (<span><span>x^2)</span>+<span>5x</span></span>+<span>49</span>
I don’t really no this answer? Sorry