9. Sebuah benda memiliki massa 4 kg mula- mula dalam keadaan diam pada sebuah bidang datar yang licin. Kemudian pada benda tersebut bekerja sebuah gaya sehingga kecepatannya menjadi \( 8 \mathrm{~m} / \mathrm{s} \). Tentukan usaha yang dilakukan oleh gaya tersebut!

HIBERNATION A female grizzly bear weighs 500 pounds. After hibernating for 6 months, she weighs only 200 pounds. What is the mean change in weight per month?

Samuel and Raj were playing a game with some narbles. In the first game, Samuel won \( \frac{4}{7} \) of \( \frac{1}{3} \) of his new total number of marbles to Raj. After the second game, Raj had 5 k marbles and Samuel had 4 k marbles. Nho had more marbles initially, and by how nuch? Find the difference in the number of narbles in terms of \( k \).

Hisoblang. a) \( 35 \mathrm{dm} 8 \mathrm{~cm}-17 \mathrm{dm}-42 \mathrm{~cm}+8 \mathrm{dm} 6 \mathrm{~cm} \) b) \( 30 \mathrm{~m} 62 \mathrm{~cm}-21 \mathrm{~m} \mathrm{7dm}+14 \mathrm{dm} 3 \mathrm{~cm}+5 \mathrm{~m}-43 \mathrm{c} \)

\( \lim _ { x \rightarrow - 5 } \frac { y ^ { 2 } - 25 } { y + 5 } = \)

A band leader randomly selects 2 students out of 100 band members. If you and your brother are both band members, what is the probability that you are both selected?