Q1
{-10, -6,-5,-4,-2.5,-1,0,2.5,4,6,7,10}
A number is to be selected at random from the set above. What is the probability that the number selected will be a solution of the equation
(x-5)(x+10)(2x-5) = 0?
A. 1/12
B. 1/6
C. 1/4
D. 1/3
E. 1/2
I got three solutions for the equation: 2.5, 10 and -5 but my final answer didn't match with OA. pls explain.
Q2 - you might find them easy
An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?
A. 2d/3
B. 3d/4
C. 4d/3
D. 3d/2
E. 8d/3
Q3
If the speed of x meters per second is equivalent to the speed of y kilometers per hour, what is y in terms of x?
A. 5x/18
B. 6x/5
C. 18x/5
D. 60x
E. 3,600,000x
thanks
{-10, -6,-5,-4,-2.5,-1,0,2.5,4,6,7,10}
A number is to be selected at random from the set above. What is the probability that the number selected will be a solution of the equation
(x-5)(x+10)(2x-5) = 0?
A. 1/12
B. 1/6
C. 1/4
D. 1/3
E. 1/2
I got three solutions for the equation: 2.5, 10 and -5 but my final answer didn't match with OA. pls explain.
Q2 - you might find them easy
An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?
A. 2d/3
B. 3d/4
C. 4d/3
D. 3d/2
E. 8d/3
Q3
If the speed of x meters per second is equivalent to the speed of y kilometers per hour, what is y in terms of x?
A. 5x/18
B. 6x/5
C. 18x/5
D. 60x
E. 3,600,000x
thanks
