Questions on Algebra: Equations answered by real tutors!

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Question 213302: solve for D: e = K(D-d)/f
Click here to see answer by stanbon(75887)

Question 213302: solve for D: e = K(D-d)/f
Click here to see answer by rapaljer(4671)

Question 213305: Solve algebraically, using one variable. The sum of two positive integers is 25. The larger integer is five less than four times the smaller one. What are the two integers?
Click here to see answer by nerdybill(7384)

Question 213216: State whether any conclusions can be made using the true statement , x = 3

If 4 x is greater than or equal to 12, then y = 6x

Click here to see answer by rapaljer(4671)

Question 213330: 7/2x + 1/2x= 3x + 3/2 + 5/2x
The answer they are coming up with is -1, can you show me how the problem is done and how they arrived at that number. Thx
Click here to see answer by stanbon(75887)

Question 213360: A sample of copper with a mass of 63.5g contains 6.02X10^23 atoms. Calculate the mass of a single copper atom.
Click here to see answer by RAY100(1637)

Question 213414: #17
IDENTIFY THE PROPERTY THAT JUSTIFIES THE STATEMENT
4-2(x-y)=4-2x+2y
Click here to see answer by nerdybill(7384)

Question 213413: #13
SIMPLIFY
16-4(3-5)^2
Click here to see answer by shymeerab(21)

Question 213412: #11
SIMPLIFY
(2.1)(0.6)(-3.5)

Click here to see answer by drj(1380)

Question 213481: Suppose that you have a supply of a 25% solution of alcohol and a 75% solution of alcohol. How many quarts of each should be mixed to produce 70 quarts that is 35% alcohol?
Click here to see answer by stanbon(75887)

Question 213480: Suppose that the length of a certain rectangle is 9 meters less than two times its width. The perimeter of the rectangle is 42 meters. Find the length and width of the rectangle.
Click here to see answer by drj(1380)

Question 213523: 8[(6-130-11]

Click here to see answer by Sunshine1245(9)

Question 213553: 1.7t+8-1.62t=.4t-.32+8
Click here to see answer by rfer(16322)

Question 213524: Find a number that is 38 less than its opposite
Click here to see answer by rapaljer(4671)

Question 213519: I need to know how to simplify 9-4r-7
Click here to see answer by rapaljer(4671)

Question 213590: A sugar free powdered drink mix sells for $2.99 per can. Each can of the mix contains 50.2g of powder, which, when added to water, will make 8 quarts of drink. What is the cost of the powdered drink mix in dollars/lb? (454g = 1lb)

Click here to see answer by rfer(16322)

Question 213616: A whole chicken sells for $7.06 and has a mass of 1.5 kg. A beef shank sells for $10.00 with a mass of 2.5 kg. Compare the per pound cost for each item. (1 kg= 2.2 lb)
Click here to see answer by RAY100(1637)

Question 213656: How do I solve 1/3 of 15?
Click here to see answer by rfer(16322)

Question 213658: xy = 11
xz = 4c
xz = 83
solve for c
Click here to see answer by edjones(8007)

Question 213527:

Click here to see answer by ichudov(507)

Question 213630: The speed limit on a certain highway is 72km/h. What is this speed in cm/s?
Click here to see answer by ankor@dixie-net.com(22740)

Question 213630: The speed limit on a certain highway is 72km/h. What is this speed in cm/s?
Click here to see answer by stanbon(75887)

Question 213688: The speed limit on a certain highway is 72 km/h. What is the speed in cm/s?
Click here to see answer by drj(1380)

Question 213726: Gold has a density of 19.3g/cm^3. What is the mass in kilograms of one cubic meter of gold?
Click here to see answer by drj(1380)

Question 213733:
Click here to see answer by jim_thompson5910(35256)

Question 213733:
Click here to see answer by ichudov(507)

Question 213735: solve algebraically, using one variable. find three consecutive intergers such that three times the sum of the first two intergers is three less than seven times the third.
Click here to see answer by jim_thompson5910(35256)

Question 213746: 1/5(2x-7)=3/10x+5
Click here to see answer by drj(1380)

Question 213745: -4(a+1)-3a=7(2a-3)+3
Click here to see answer by drj(1380)

Question 213745: -4(a+1)-3a=7(2a-3)+3
Click here to see answer by jim_thompson5910(35256)

Question 212003: 100-4u/3=5u+6/6+6
Click here to see answer by checkley77(12844)

Question 213777: 1. x^3+216=0

2. 5x^3+30x^2+45x=0

3. 1/x^2+8/x+15=0

Click here to see answer by drj(1380)

Question 213791: (6/2x-2)-(1/x+1)=(2/2x+2)+1
Click here to see answer by ichudov(507)

Question 213816: 2x +3y=6
Click here to see answer by drj(1380)

Question 213822: Twenty-one more than three times a number is twelve less than the sum of the number and 5. Find the number.
Click here to see answer by nerdybill(7384)

Question 213934: -3x+5=7
Click here to see answer by rfer(16322)

Question 213975: Hi,
I tried to do this problem, and I would just like to check with you.
The problem is:
P=2L+2W solve for L
so i subtracted 2W from both sides
and got: P-2W=2L
then i divided by 2 and got
L=P-2W/2
am i correct? or is there something else that needs to be done?
thanks in advance
Click here to see answer by stanbon(75887)

Question 213956: how do you solve A= 1/2bh for b?
Click here to see answer by rfer(16322)

Question 213983: Please describe the range of the radii of most atoms in nanometers.
Click here to see answer by stanbon(75887)

Question 213985: kirra is two years older then reggie. reggie is six times as old as delia. the average of their ages is nine years and four months. how old is each of them?
Click here to see answer by Earlsdon(6294)

Question 213995: Oxygen and hydrogen react explosively to form water. In one reaction, 6g of hydrogen combines with oxygen to form 54g of water. How much oxygen was used?
Click here to see answer by Alan3354(69443)

Question 214006: You are given an endpoint and the midpoint of a line segment. Find the coordinates of the other endpoint. Each midpoint is denoted by M(x, y)

B (5,7)

M (-1,0)

Click here to see answer by drj(1380)

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