The equation $9x^2 + 30x + 25 = 0$ has .............. in $R$.

$x=2$ is a solution of the equation $\ldots \ldots \ldots \ldots.$

The price of corn oil is ₹ $x$ per $kg$. If the price of corn oil is decreased by ₹ $10$ per $kg$,then how many kilograms of corn oil can be obtained for ₹ $500$ at the new rate?

$A$ train,travelling at a uniform speed for $360\, km$,would have taken $48\, min$ less to travel the same distance,if its speed were $5\, km/h$ more. Find the original speed of the train (in $km/h$).

State whether the following statement is 'True' or 'False'. Justify your answer: If in a quadratic equation the coefficient of $x$ is zero,then the quadratic equation has no real roots.

The golden ratio,often denoted by the Greek letter $\phi$,is a special number. Which of the following is the golden number?