Question

3. The discriminant of the quadratic equation x2 - 4x + 1 = 0 is:

(A) 10
(B) 11
(C) 12
(D) 14
4. Which term of the AP: 4,9, 14, ..., is 254?
(A) 50th
(B) 51th
(C) 52nd
(D) 53rd
5. The centroid of AABC, where A(-4, 6), B(2,-2) and C(2, 5), is:
(A) (0, 2)
(B) (0, 3)
(C) (1,3)
(D) (1, 2)
6. A man goes 15 m due west and then, 8 m due north. How far is he from the start
(A) 15 m
(B) 8 m
(C) 17 m
(D) 16 m
.
7. 4 tan? A - 4 sec? A is equal to:
(A) 2
(B) 3
(C) 4
(D) -4
8. If the perimeter of a semi-circular protractor is 36 cm, then its diameter is:
(A) 12 cm
(B) 13 cm
(C) 14 cm
(D) 15 cm
9. A box contains 20 balls bearing numbers 1, 2, 3, 4, 20. A ball i
from the box. What is the probability that the number on the ball is divisible b
1
2.
3
(A)
(B)
(C)
(D)
10
7.
20
5​

Answer 1

Answer:

I no understand pls explain me again

Answer 2

3.) (c) 12

Solution: a=1

b= -4

c=1

Discriminant (D) = b²-4ac

=(-4(²-4(1)(1)

=16-4

=12