11)Which of the following is a solution for the equation 2(x + 3) = 18?
12)If 3x + 4y – k = 0 and 6x + 8y – 4 = 0 are coincident lines, then the value of k is
13)The roots of x- 
= 2 are
= 2 are
14)If one root of 3x2 + 2x + k = 0 is the reciprocal of the other, then the value of k is
15)If the roots of 2 x2 + kx + 3 = 0 are real and equal, then the value of k is
16)A ball is thrown vertically upward from the ground. The distance s in t seconds is given by s = 4 t2 +t-3. After how many seconds does the ball come to rest?
17)The product of the roots of √2 x2 – 10x + 5√2 = 0 is
18)The discriminant of = 2 is
= 2 is
19)If twice the age of A is added to B’s age, the sum is 45 and if twice the age of B is added to A’s age, the sum is 30. Then the age of B is
20)3 pens and 5 pencils together cost ₹ 35, whereas 5 pens and 3 pencils together cost ₹ 37. The cost of a pencil is
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