Tutors Answer Your Questions about expressions (FREE)
Question 146367: When the problem states "the sum of," I know it means to add, but what does it mean "the sum of the square of a"? And what are the other names for add, subtract, divide & muiltiply? Is there w website that has this inforrmation?
Click here to see answer by Earlsdon(6287)  |
Question 147602: Hi,
I am attempting to solve an equation with parentheses inside of brackets. The problems are similar to 9[-7-(77-43)]
I know to solve the parenthases first so I have and I can chane the signs of the terms by doing the following:
9[-70+(-77+43)]
9[-70+34]
9[-36]
-324
This answer seems incorrect but I am unsure where I went wrong. Can you help?
Thank you very much.
Click here to see answer by jim_thompson5910(28598) |
Question 147602: Hi,
I am attempting to solve an equation with parentheses inside of brackets. The problems are similar to 9[-7-(77-43)]
I know to solve the parenthases first so I have and I can chane the signs of the terms by doing the following:
9[-70+(-77+43)]
9[-70+34]
9[-36]
-324
This answer seems incorrect but I am unsure where I went wrong. Can you help?
Thank you very much.
Click here to see answer by oscargut(891)  |
Question 148751: At a well known university, Ό of the undergraduate students commute and 1/3 of the graduate students commute. One-tenths of the undergraduate students drive more than 40 miles daily and 1/6 of the graduate students drive more than 40 miles daily. If there are twice as many undergraduate students as there are graduate students, then what fraction of the commuters drive more than 40 miles daily? Please help? Is this how to do it?
The fraction of the undergraduate and graduate students who commute is represented by 1/4x +1/3x divided by 1/10x +40 divided by 1/6x + 40. (I'm stuck)
Click here to see answer by ankor@dixie-net.com(15660)  |
Question 150558: Im supposed to solve the below expression for X, but I cant figure out what Im doing wrong. I believe your supposed to multiply by the LCD to remove the fraction term. Then when I calculate, Im completely lost. Maybe Im using the wrong LCD.
Problem is x+3/6 - x/5 = 9x-5/30
LCD is 30, so I multiplied each term by 30
5(x+3) 6x = 9x 5
5x + 15 6x = 9x 5
-x + 15 = 9x 5
15 = 10x 5
20 = 10x
x=10
*Answer in my book is x=2
Problem is: 4/x + 2/x+1 = 5
LCD is x(x+1), so I multiplied each term by x(x+1)
4(x+1) + 2x = 5x(x+1)
4x + 4 + 2x = 5x^2 + 5x
6x + 4 = 5x^2 + 5x
4 = 5x^2 + 5x 6x
4 = 5x^2 x
*Answer in my book is x=1
Problem is 24/8x - x/3 = 3-x/6
LCD is 24x, so I multiplied each term by 24x
72 8 = 4x(3-x)
72 8 = 12x 4x^2
64 = 12x 4x^2
*Answer in my book is x=3 or x=6
Problem is 6/4(x-2) + 1/4 = 4/x
LCD is 4(x-2), so I multiplied each term by 4(x-2)
6 + x 2 = x(x-2)
4 + x = x^2 2x
4 + x = 0
x = -4
*Answer in my book is x=3 or x=6
Click here to see answer by jim_thompson5910(28598) |
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