Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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Algebra: Expressions involving variables, substitution

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Question 51840: u-v=0
7u-v=0

Click here to see answer by stanbon(26259)

Question 51878: Translate into a variable expression. then simplify the expression.
sixteen multiplied by one-fourth of a number

Click here to see answer by tutorcecilia(2042)

Question 51877: -2x+x^2-15
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Question 51831: 3x-y=5
2x+y=0
Click here to see answer by scoop(27)

Question 51838This question is from textbook

: Can you help me solve this problem? 5a + 6b + 7a=This question is from textbook

Click here to see answer by tutorcecilia(2042)

Question 51828This question is from textbook Algebra

: four times the sum of r and s, increased by twice the difference of r and sThis question is from textbook Algebra

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Question 51900: I am having a problem solving this problem:
For the equation x - the square root of x = 0 , perform the following:
Solve for all values of x that satisfies the equation
Thanks for your help.
Click here to see answer by funmath(2873)

Question 51968: I am not sure if I am getting the right answer for this problem. I need a little help.
For the equation x - the square root of x = 0, perform the following:
Solve for all values of x that satisfies the equation
Graph the functions y = x and y = the square root of x on the same graph (by plotting points if necessary). Show the points of intersection of these two graphs.
I am not sure how to graph this function. Thanks for your time.
Click here to see answer by funmath(2873)

Question 51990This question is from textbook prentice hall
: I need help in answering,what is [x+y4] for x =4 and y = 8 the answer I got was 3 is that right. the 4 belongs under the x+y This question is from textbook prentice hall

Click here to see answer by checkley71(8405)

Question 52019: how do you solve this problem?
y=8-x for x=-6?
how do i start solving this problem?
Click here to see answer by rchill(405)

Question 52038: b to the eighth power
Click here to see answer by AnlytcPhil(958)

Question 52219: here are 2 expressions:-
a: x^2 + x - 3
b: y^3 - 2y + 6
substitute in these numbers to evaluate the expressions
3, -3, 0.5, 0.35
Click here to see answer by AnlytcPhil(958)

Question 52253: What is B for A=1/2h(B+b)?
Click here to see answer by tutorcecilia(2042)

Question 52246: Solve in terms of X. The sum of three numbers is 75. The second number is 8 more than the first.
I keep trying to set this up as follow:
Let 1st number= X
Let 2nd number= X + 8
Let 3rd number= 75-x-(x+8)
When I set it up as x+x+8+75-x-(x+8)=75 I am unable to come up with the value of X. Help please. Thanks
Click here to see answer by rchill(405)

Question 52270: i need help with this problem:
3.5x+5-1.5x=8

Thanks!
Click here to see answer by rchill(405)

Question 52239: separate 72 into two parts, one of which shall be 1/3 of the other
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Question 52269: order from least to greatest: -5/7,-8/9,-3/4,-7/8
Click here to see answer by tutorcecilia(2042)

Question 52176: I have tried this problem in so many ways. My study guid for the placement exam says Alogebriac expression- compute and simplify.
(x-3)- (x-1)(x-1)
the answer is -6x+10 but I have no idea how they got that.
Click here to see answer by rchill(405)

Question 52295: 7-2n=n-14 Can you help me finging the solution The type of question is equation with variables on both sides. my answer was -21 I am not sure if i am right.
Click here to see answer by checkley71(8405)

Question 52289: Simplify
6(2a+1)+3(2+3a)
Click here to see answer by checkley71(8405)

Question 52312: Write an algebraic expression: 6 less than twice a number.
Is the answer: 2n-6 ?
Click here to see answer by rapaljer(3612)

Question 52440: What is solution to this system of equations?
2x+4y=2/3
3x-5y=-10
Click here to see answer by AnlytcPhil(958)

Question 52022This question is from textbook Middle School Math Course 3
: Here is my math question, Insterste 35 runs north and south from Laredo, Texas to Duluth, Minnesota, covering 1568 miles. There are 505 miles of I-35 in Texas and 262 in Minnesota. Write and solve an equation to find m, the number of miles of I-35 that are not in eihter state. This question is from textbook Middle School Math Course 3

Click here to see answer by checkley71(8405)

Question 52587: Thirty minutes before the play began, 45% of seats in the theater were occupied. If 110 seats were NOT occupied, how many seats in all?
Click here to see answer by checkley71(8405)

Question 52667This question is from textbook
: please help me solve the equation : -12q+4=8q-6This question is from textbook

Click here to see answer by funmath(2873)

Question 51437: I am having a hard time solving this problem.
The .
Thanks for your time.
Click here to see answer by vanetiks(6)

Question 52744This question is from textbook Algebra 1
: Ho w do i solve for t in this problem?: This question is from textbook Algebra 1

Click here to see answer by tutorcecilia(2042)

Question 52743This question is from textbook Algebra 1
: Ho w do i solve for t in this problem?: This question is from textbook Algebra 1

Click here to see answer by whitetiger78(1)

Question 52785: 11.2n + 6 = 5.2n
Click here to see answer by checkley71(8405)

Question 52709: 1/3(4j+2k-6j+3k)
Click here to see answer by rchill(405)

Question 52906: 8(4U-1) -12U= 11(2U-6)
WHICH VARIABLE WOULD YOU REMOVE FIRST. I AM UNSURE HOW TO SOLVE THIS LONGER VARIABLE. I AM COMFORTABLE WITH SOLVING SMALLER VARIABLES BUT WITH THIS I AM GETTING MORE CONFUSED.
Click here to see answer by antsinmypants(6)

Question 52701: rearrange 5x+y=4
Click here to see answer by rchill(405)

Question 52894: Could you please help me find the missing step to reach the answer in the following problem?
Solve for the indicated variable:
S=(rL-a)/(b-a); solve for a.
The answer to this problem is a=Sb-rL/S-1
My first step is multiplying both sides by (b-a) and getting:
Sb-Sa=rL-a
Next I try to get both a's on the same side, so I move -Sa over to the right:
Sb=rL-a+Sa
Then I realize that once the S is gone on the right side, the a's will cancel.
Click here to see answer by rchill(405)

Question 53012This question is from textbook McDougal Littell Algebra 1

: Practice and Applications
solving equations:
26.) -7x + 4x = 9This question is from textbook McDougal Littell Algebra 1

Click here to see answer by funmath(2873)

Question 53018: what is 80 -x =750
Click here to see answer by checkley71(8405)

Question 53067: Please help me solve:
3(-2-3x)=-9x-4
Click here to see answer by math_iz_hard(8)

Question 53162: describe a pattern in the sequence of numbers. Predict the next number:
2,-6,18,-54...
Click here to see answer by Smartmathy(3)

Question 53177: the correct way to solve --- 2(3x-1)2 (which is small) if x = 4
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Question 53175: 13x-4(2x+5)=15
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Question 53172: 3x+2(x+5)=15
Click here to see answer by rchill(405)

Question 53237This question is from textbook Prentice Hall Mathematics Algebra 1
: The width of a rectangle is one half its length. The perimeter of the rectangle 54cm. What are the width and length of the rectangle?This question is from textbook Prentice Hall Mathematics Algebra 1

Click here to see answer by pwt(2)

Question 53211: Mary and Lucy both leave from the same bus station. Mary drives 10mph slower than Lucy. In three hours, the are 260 miles apart. How do you set up an equation to solve?
~Confidently Confused~
Click here to see answer by ankor@dixie-net.com(6691)

Question 53359: When a number of units are sold, the price of each unit (in dollars) is given by
P= -x/2+75. Find the unit price when the following quantities are sold:2,7,9,11.
McGraw Hill 6th edition, chapter 6. problem # 48. Thankyou ever so much!!
Click here to see answer by stanbon(26259)

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