Answer:
7) C. 1000
8) F. 14 and 15
9) C. [tex]\sf \sqrt{5^2 + 6^2}[/tex]
Explanation:
7.
⇒ 100(3 + 0.2)² - 24
⇒ 100(3.2)² - 24
⇒ 100(10.24) - 24
⇒ 1024- 24
⇒ 1000
8.
⇒ √50 + √60
⇒ [tex]\sf \sqrt{2 \ \times \ 5^2} + \sqrt{2^2\:\times\: 15}[/tex]
⇒ [tex]\sf 5\sqrt{2 } + 2\sqrt{ 15}[/tex]
⇒ 7.071 + 7.745966
⇒ 14.817
So, it lies between 14 and 15.
9.
A, B, D when simplified gives 11 as an answer.
When simplify C,
[tex]\sf \sqrt{5^2 + 6^2}[/tex]
[tex]\sf \sqrt{25 + 36}[/tex]
[tex]\sf \sqrt{61}[/tex]
[tex]\sf 7.8102396[/tex]
This value lies between 7 and 8.
