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

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 355719: Simplify: -4-[3-4(2x-5)]
Click here to see answer by nyc_function(2733)

Question 355842: I need help solving this equation:
5x + 2x = 150
Click here to see answer by Alan3354(31510)

Question 355893: hi i am trying to do an equation and the type of equation is simlifying each side before solving equantions.
the question is 5-(t+3)=-1+2(t-3)
i tried solving it but i get stuck right at the begining.
i know that i have to use the distibuative property but what the heck do i do when isays 5-(t+3)how do i use the property with that?
Please help
Click here to see answer by jerryguo41(162)

Question 356123: 3/4(3x-1/2)-2/3<1/3
Click here to see answer by Fombitz(13828)

Question 356447: ax + b – 4 = b and a is not equal to 0 then x = 4/a

always
sometimes
* never.
Click here to see answer by Fombitz(13828)

Question 356453: How do you simplify ? Please show work.
Click here to see answer by Fombitz(13828)

Question 356481: How do you simplify using the distirbutive property? Please show work.
Click here to see answer by edjones(7569)

Question 356620: 3x+y=10
y=-2x+4
solve this by using substitution
Click here to see answer by robertb(4012)

Question 356641: The formula for the area of a riangle is A=1/2bh, where b represents the length of the base and h represents the height

Click here to see answer by Alan3354(31510)

Question 356712: Solve and check.
4y − 12 = −3 − 3y

Click here to see answer by mananth(12270)

Question 356714: Solve and check.
3/4-3/5x=23/20
x=?
Click here to see answer by robertb(4012)

Question 356751: y-1/2=2/3(x-1/4)
Click here to see answer by Fombitz(13828)

Question 356915: A farmer has a rectangular garden plot surrounded by 220 feet of fence. Find the dimensions of the garden if its area is 2400 square feet.
Click here to see answer by checkley77(12569)

Question 356917: A chemist has two large containers of salt solution. The concentration of the salt is different in the two containers. She blends 80mL of the first solution with 320 mL of the second solution to obtain a solution with concentration 56g/mL. She blends 300 mL of the first solution with 200 mL of the second solution to obtain a solution with concentration 48g/mL. What are the concentrations of the original solutions.
Click here to see answer by mananth(12270)

Question 356982: Solve equations containing rational expressions:
z/z+3=3z/5z-1
Click here to see answer by robertb(4012)

Question 356956: -2a2/3a2*20a/15a3
Click here to see answer by Fombitz(13828)

Question 357092: Hi, i need help with those questions am practicing but i dont understand how to work out the rearrangement etc. please show your working out clearly many thanks,

1. The speed of a car after t seconds is given by the formula v= u + at where u is the starting speed in metres per second (m s-¹) and a is the acceleration in metres per second per second (ms-2).
a) A car joins a motorway at a speed of 25 ms-1 and accelerates at 0.65 ms -² for 12 seconds. Find its speed at the end of this time.
b) Rearrange this formula to make the subject (i) u (ii) t

2. if a ball is thrown up in the air at a velocity of v, the height it reaches is given by h = V2/2g

Where g is the acceleration due to gravity.
a) Find the height reached by a ball thrown up at a velocity of 15 ms-1.
b) B) Rearrange this formula to make the subject v.

3. A formula for converting temperature is C=5/9(F- 32)

Where C is the temperature in degree Celsius and F is the temperature in degrees Fahrenheit
a)An old recipe gives the oven temperature 375° F. Covert this temperature to Celsius.
b)Rearrange this formula to make the subject F.
Click here to see answer by stanbon(57956)

Question 357511: How do you solve for x? 4x+(4x-12)=180
Click here to see answer by rfer(12727)

Question 357547: Solve the given formula for the variable and state restrictions, if any, for the formula obtained to be meaningful
A= 1/2h(a+b); h
Could you please show the work?
Click here to see answer by Alan3354(31510)

Question 357661: if b equals 2 what is 5 b to the power of 3

Click here to see answer by Fombitz(13828)

Question 357682: Twice the greatest of three consecutive even integers is 4 more than the smallest of the three numbers. Find the numbers.
Click here to see answer by mananth(12270)

Question 357680: The elimination method can someone help
3x-2y-z=14
x-3y-3z=8
2x-4y-2z=8
Click here to see answer by Edwin McCravy(8999)

Question 357509: p = ab + ac, solve for a
Click here to see answer by nyc_function(2733)

Question 357868: 2x^2/3-3x^1/3=20
Solve for x
Click here to see answer by Fombitz(13828)

Question 357780: 9m + n = 13
m-9n=47
Click here to see answer by Fombitz(13828)

Question 358035: XYZ for x=5,y=12,and z=30
Click here to see answer by Fombitz(13828)

Question 358053: How do you figure out 3w+2=w-4? What are the steps to figure it out?
Click here to see answer by nyc_function(2733)

Question 358053: How do you figure out 3w+2=w-4? What are the steps to figure it out?
Click here to see answer by mathtutor19(8)

Question 358151: How do I solve this problem please explain work provided with the answer
qx-3=d,for q
Click here to see answer by Alan3354(31510)

Question 358256: Find the total weight of the boxes of pecans in a shipment of 3 lb boxes of pecans and 2lbs boxes of walnuts.
1)there were 24 fewer 2 lb boxes of walnut than 3 lb boxes of pecans.
2)the total weight of the shipment was 462 lbs.

tried: 3n + 2(n-24)=462; 3n +2n-48=462;5n -48 +48=462-48=414; 5n=414=82.8
Click here to see answer by stanbon(57956)

Question 358263: I'm in 8th grade. I went home sick today and missed some of the classroom lecture, but took the homework home to see if I could figure it out myself. I'm stuck on this problem; 30 is 20% of what number? I set this equation up but don't know if its right; 30 over x = 20 over 100. Need help solving too. Thanks.
Click here to see answer by robertb(4012)

Question 358289: What is the variable for 6(7-6d)+20=-26
Click here to see answer by mananth(12270)

Question 358309: Two numbers differ by 6. Five times the smaller is 6 more than three times the larger. What are the numbers?
Click here to see answer by mananth(12270)

Question 358318: The perimeter of the rectangle below is 184 units. Find the length of side CD .
Side AD = 4z-1
Side AB = 5z+3
D-----------C
[------------]
[------------]
[------------]
A-----------B
Click here to see answer by user_dude2008(1861)

Question 358244: 1/3n+10=-21
Click here to see answer by minijavi19(2)

Question 358244: 1/3n+10=-21
Click here to see answer by Alan3354(31510)

Question 358381: "Simplify each expression below."
An example would be:
11-(3x-6)+2(4x+5)-x
I'm so confused on the subject because I switched schools. I'm new to the school and so the subject's new.
I keep trying to learn how to simplify equations, but I just can't seem to comprehend it...
Can someone please show me examples on how to simplify algebraic expressions? If so, that's be wonderful.
Thank you.
Click here to see answer by mananth(12270)

Question 358538: I need help on this for a school project:
c=3.14d solved for d
a=3.14r^2 solve for r^2
Click here to see answer by checkley77(12569)

Question 358527: I need help on this for a school project:
A=1/2b*h solved for b
A=1/2b*h solved for h
A=b*h solved for b
A=b*h solved for h

Click here to see answer by checkley77(12569)

Question 358693: My son has a problem and i need to know how to do it so i can help.
8x+2=3x+1
Click here to see answer by Alan3354(31510)

Question 358709: how do you solve x=-2y+1 X=y-5 using substitution with no solution or infinitely many solutions where appropriate?
Click here to see answer by solver91311(17075)

Question 358683: find the missing coorinate of ( ,3) that is a solution to the equation y=-5+2
Click here to see answer by Alan3354(31510)

Question 358707: peform the indicated operation
3/8+(-4/9)
Click here to see answer by nyc_function(2733)

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