A system of equations is given below.
{
5
x
−
2
y
=
3
3
x
−
y
=
4
{
5x−2y=3 3x−y=4
Which of these procedures will eliminate a variable in one of the equations in the system above?
A.
Multiply the second equation by –2 then add the result to the first equation.
B.
Multiply the second equation by 2 then add the result to the first equation.
C.
Multiply the first equation by –2 then add the result to the second equation.
D.
Multiply the first equation by 2 then add the result to the second equation.
Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?
Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?