Priya has a recipe for banana bread. She uses \( 7 \frac{1}{2} \) cups of flour to make 3 loaves of banana bread. Andre will follow the same recipe. He will make \( b \) loaves of banana bread using \( f \) cups of flour. Which of these equations represents the relationship between \( b \) and \( f \) ?

(a) \( \frac{2 x-3}{4}=5 \)

\( \underline { y } ^ { \frac { 1 } { 2 } } \times \underline { y } ^ { \frac { 1 } { 2 } } \)

The ring \( \mathbb{Z} \) has no nontrivial idempotent elements, whereas \( \mathbb{Z} \times \mathbb{Z} \) has the idernpotent elements \( (1,0) \) and \( (0,1) \).

\( ( a + b ) ( a - b ) = a ^ { r } - b ^ { r } \)

ection-A consists of 20 questions of 1 mark each. The equation which has no real roots is \( \begin{array}{llll}\text { (a) } 3 x^{2}=8 x-2 & \text { (b) } x^{2}-11 x=16 & \text { (c) } 7 x^{2}-1=-8 x & \text { (d) } 2 x^{2}+5 x+6=0\end{array} \)