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Tutors Answer Your Questions about Expressions-with-variables (FREE)
Question 42275: Jonathon and Tim started running toward each other, Jonathon at 16 yards per minute and Tim at 18 yards per minute. If they were 1360 yards apart when they started running, how long did it take for them to collide?
Click here to see answer by fractalier(1804)   |
Question 42228: I need help with the addition method. I have a problem that i cannot figure out. Please help.
6x-5y+z=2
3x-4y+z=2
4x+2y-z=-5
The available ansswers are as follows:
A. (-3, -9, -25)
B. (0, -1, -3)
C. real numbers
D. No soulution
Thank you
Click here to see answer by venugopalramana(3286)  |
Question 43004: I'm looking for a solution to this:
Using the variable "t" to represent Tom's score, translate the following sentence into a mathematical expression:
24 is the product of 2 and Tom's score
Click here to see answer by pwac(251)  |
Question 43324: Two boys on bikes start at the same time at the same place and travel opposite directions. One travels at the rate of 10 miles per hour and the other at the rate of 6 miles per hour. In how many hours will they be 72 miles apart?
Click here to see answer by josmiceli(3003) |
Question 43500: Will you please help me with this word problem. The units digit of a two-digits number is 1 more than 4 times the tens digit. If the digits are reversed, the new number is 5 more than 3 times the original number. Find the original number.
Click here to see answer by psbhowmick(456) |
Question 43598: Will you please help me with this word problem: Eight minutes after a bank was robbed, the police started a chase to pursue the thief. The thief was driving at 70 km./hr., while the police were driving at 90 km./hr. How long did it take the police to catch up with the thief?
Click here to see answer by stanbon(26259) |
Question 43600: I need help with this word problem: Rick and Robby left home for a fishing trip at 8:30 a.m. They were traveling at 30 km./hr. Part of the way there, their car broke down. They walked back at a rate of 10 km./hr. and returned home at 10:30 a.m. How far from home were they when the car broke down?
Click here to see answer by aaaaaaaa(138) |
Question 43716: I have another word problem that i am stuck on. Will you please help? "A large pipe can empty a tank in 5 hours, and a smaller pipe can empty it in 6 hours. How long would it take to empty the tank if both pipes were draining the tank?
Click here to see answer by vihits13(20) |
Question 43906: rearrange the second equation (x-2y=-6) to give
2y=x-6
now divide both sides by 2to give the equation of the second line as:
y=1/2x-3
As you can see, this is also the equation of the fisrt line.
Because the two lines have the same equation, they are exactly the same. Hence they have the same gradient and are parallel. Any value of x put into either equations will give the same resulting value for y. Therefore there is an infinite number of solutions.
I hope this helps.
If you any other problems don't hesitate to email me at adam.chapman@student.manchester.ac.uk
Click here to see answer by adamchapman(301) |
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