1 k and t are integers
and k²-t² is an odd integer, which of the following must be an even integer ? .
A. k+t+2
B. k²+2kt+t²
C. k²+t²
B. k²+2kt+t²
C. k²+t²
2.
In the xy-coordinate system, if (a,b) and (a+3, b+k) are two
points on the line defined by the equation x = 3y-7, then k=
A. 9
B. 3
C. 7/3
D. 1
E. 1/3
B. 3
C. 7/3
D. 1
E. 1/3
3.
Peter and Paul start simultaneously on 2 different cars from
Point A and travel towards Point B at speeds of 52 kmph and 39 kmph
respectively on the same road. As soon as Peter reaches Point B, he returns
back to Point A on the same road and meets Paul on the way. How far from Point
B do the two friends meet, if the distance between the 2 points is 70 kms?
4 In triangle ABC, AD is the bisector of |A, AB=10 cm, AC=14 cm and area of triangle ABD = 140 sq cm. Find area of triangle ACD
5.The rate of a certain
chemical reaction is directly proportional to the square of the concentration
of chemical A and inversely proportional to the concentration of chemical B
present. If the concentration of chemical B is increased by 100%, which one of
the following is the closest to the percentage change in the concentration of
chemical A required to keep the reaction rate unchanged?
A. 100% decrease
B. 50% decrease
C. 40% decrease
D. 40% increase
E. 50% increase
A. 100% decrease
B. 50% decrease
C. 40% decrease
D. 40% increase
E. 50% increase