1) If y = 5, then what is the value of $10y\sqrt{ y^{3}-y^{2} }?$ A) 375 B) 450 C) 500 D) 550 Answer: Option CExplanation:$10y\sqrt{ y^{3}-y^{2} } = 10 \times 5 \sqrt{ 5^{3}-5^{2} } $$=50 \times \sqrt{ 125- 25}$$= 50 \times \sqrt{ 100}$ $= 50 \times 10 = 500$
