Questions on Algebra: Evaluation of expressions, parentheses answered by real tutors!

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Question 1033372: Solve by substitution method:
(x+2)/5 = (y-1)/2
and
(x-1)/2 - (2y+1)/3 = 1
How to do this? Please have steps

Click here to see answer by josgarithmetic(39623) About Me 
Question 1033372: Solve by substitution method:
(x+2)/5 = (y-1)/2
and
(x-1)/2 - (2y+1)/3 = 1
How to do this? Please have steps

Click here to see answer by ikleyn(52832) About Me 

Question 1033644: The product of twice a quanity x and the different of that quanity and 7
Click here to see answer by fractalier(6550) About Me 
Question 1033644: The product of twice a quanity x and the different of that quanity and 7
Click here to see answer by ikleyn(52832) About Me 

Question 1034046: the product of a number and 3 is 4 less than the quote of a number and 5.
Click here to see answer by fractalier(6550) About Me 

Question 1034111: The reciprocal of resistance is.........
Click here to see answer by ikleyn(52832) About Me 

Question 1034283: Solve the system.
{x+2y=-9}
{5x+10y=-45}
a. inconsistent (no solution)
b. (-9, 0)
c. (0, 0)
d. y=-x/2- 9, where x is any real number




Click here to see answer by ikleyn(52832) About Me 

Question 1034281: Perform the indicated operation, whenever possible.
[-1 0] [-1 4]
[4 2] - [ 3 1]
a.[-2]
b.[0 4]
[-1 -1]
c.[-2 4]
[7 3]
d.[0 -4]
[1 1]

Click here to see answer by robertb(5830) About Me 

Question 1034375: Make V the subject:
R=(2r)/(2-V^2r)
Could you please give a step-by-step explanation Thanks!

Click here to see answer by stanbon(75887) About Me 

Question 1034374: Make V the subject:
R=(2r)/(2-V^2r)
Could you please give a step-by-step explanation Thanks!

Click here to see answer by stanbon(75887) About Me 

Question 1034400: At what time(s) after 3 pm will the minute hand and the hour hand be at right angles?

Click here to see answer by ikleyn(52832) About Me 

Question 1034492: How many items are in each box if 900 Items are divided among three boxes such as the first box contains half of the second box while the third box contains thrice of the first box?
All I know is the first box =150
The second box is = 300 and the third box is = 450

Click here to see answer by Theo(13342) About Me 

Question 1034957: Help with pre cal substitution questions!!
Solve Using Substitution
2x+4=4
(X+1)^2 + (y-2)^2 = 4
Solve using addition
x^2-4y^2 = -7
3x^2 + y^2 =31

x^2 - 2y = 8
x^2 + y^2 = 16

Solve each system by the method of your choice
2x^2 + y^2 = 18
xy=4


x^3 + y = 0
x^2 - y = 0

x^3 + y = 0
2x^2 - y = 0


x^2 - y^2 - 4x + 6y - 4 = 0
x^2 + y^2 - 4x - 6y + 12 = 0

Click here to see answer by ikleyn(52832) About Me 

Question 1035756: Simone sees two red birds (r) for every blue bird (b) she sees. If Simone sees a total of 12 red birds, which equation could be used to determine how many blue birds she sees
Click here to see answer by fractalier(6550) About Me 

Question 1036040: simplify (-4)^2/(1-3)^2-(-2)

Click here to see answer by Boreal(15235) About Me 

Question 1037010: Rewrite without rational exponents and simplify if possible
(5a^2b)^3/5

Click here to see answer by Theo(13342) About Me 

Question 1037140: (2x-1)^2 = 9
Solve for x.
Do I expand the brackets?

Click here to see answer by josgarithmetic(39623) About Me 
Question 1037140: (2x-1)^2 = 9
Solve for x.
Do I expand the brackets?

Click here to see answer by MathTherapy(10555) About Me 
Question 1037140: (2x-1)^2 = 9
Solve for x.
Do I expand the brackets?

Click here to see answer by ikleyn(52832) About Me 

Question 1037141: Find the compound interest on $5000 at 6% pa.a compounded monthly for 2 years (2dps).
I know the formula but how do you substitute this question into the formula?
Thanks very much.

Click here to see answer by josmiceli(19441) About Me 

Question 1037218: Evaluate 5y^2 for y=-4
Click here to see answer by Alan3354(69443) About Me 

Question 1037559: Evaluate the expression below when x = -4.
4x2 - 2x × 15

Click here to see answer by Alan3354(69443) About Me 

Question 1037570: Simplify the expression and combine like terms of -3 (3y-10)+2 (2y+8)=
Click here to see answer by rfer(16322) About Me 

Question 1037607: 30 + 8 - 3 (4 exponent 2 - 5 exponent 2)
I tried to do this problem but when I did the exponents, you can't subtract 16 from 25?? What am I doing wrong?

Click here to see answer by josgarithmetic(39623) About Me 

Question 1037781: Solve root3 x
+
root2 x
= 1
I mean the root sign is just for the 3 or the 2 and the x is separately after that.

Click here to see answer by Alan3354(69443) About Me 

Question 1037934: Expand (1-2x)^6 up to x^3. Hence find an approximation for (49/50)^6 correct to 3 decimal places.
Click here to see answer by Aldorozos(172) About Me 

Question 1038050: Pythagorean theorem. Solve for x and the line value. 14^2= 3x^2 - x^2
Click here to see answer by Boreal(15235) About Me 

Question 1038099: ( c-8d) (c +8d)
(5c+ 2) *2

Click here to see answer by stanbon(75887) About Me 

Question 1038389: Whats an example of a mixture problem that could be
represented by the expression 8 + x / 13 + x + y ?
Info: A shop sells candy and nuts by the pound. One item is a mixture made with 8 pounds of peanuts and 5 pounds of cashews. Therefore, 8 / 8 + 5 or 8 / 13 of the mixture is peanuts.If the store adds an additional x pounds of peanuts to the mixture, then 8 + x / 13 + x of the mixture will be peanuts.

Click here to see answer by jorel555(1290) About Me 

Question 1038421: Simplify 2 sqr(18x^3 y)
What is the simplest form, help

Click here to see answer by Othel(27) About Me 

Question 1038420: Factorise (a^2)(b^2) - c^2
How thanks

Click here to see answer by josgarithmetic(39623) About Me 

Question 1038697: Twice the sum of k and 4

Click here to see answer by Fombitz(32388) About Me 

Question 1038774: Express (rootx)/y as a complete radical.
What is a radical again, is the answer the same as the question?

Click here to see answer by solver91311(24713) About Me 

Question 1038771: List the possible values of a:
2a+1<14<=5a-2
Is there a way to work this out without guessing? Thanks.

Click here to see answer by solver91311(24713) About Me 

Question 1038773: Factorise:
(s^3 / 8) + (g^3 / 27)

Click here to see answer by josgarithmetic(39623) About Me 
Question 1038773: Factorise:
(s^3 / 8) + (g^3 / 27)

Click here to see answer by ikleyn(52832) About Me 

Question 1038832: Example of a rational equation that may be solved by first multiplying each side by 5(a + 2) ?
Click here to see answer by solver91311(24713) About Me 

Question 1039111: can you walk me through solving twenty minus negitive x is greater than or equal to 16?
Click here to see answer by ikleyn(52832) About Me 

Question 1039122: 6r+r

Click here to see answer by ikleyn(52832) About Me 

Question 1039200: Find the general equation of a line passing through (0,k) and (k,k^2) given that k is not equal to 0
So you find the gradient, which is k-1, then what do you do?

Click here to see answer by Boreal(15235) About Me 

Question 1039201: Find the value of k if the line 3x-y+1-0 is parallel to the line (k-2)x-ky+2=0
Isn't the gradient 3, then what do you do

Click here to see answer by Boreal(15235) About Me 

Question 1039204: factors of -15=-8x2+2x
Click here to see answer by josgarithmetic(39623) About Me 
Question 1039204: factors of -15=-8x2+2x
Click here to see answer by ikleyn(52832) About Me 
Question 1039204: factors of -15=-8x2+2x
Click here to see answer by MathTherapy(10555) About Me 

Question 1039240: 5[3(7-t)-4(8+2t)]-20=-6]2(6+3t)-4]
Click here to see answer by JoelSchwartz(130) About Me 

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