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

Tutors Answer Your Questions about expressions (FREE)

Question 1064927: Speed of light is 3 x10^8 m/s. At this speed, how long a stars light will take if the star is 8 light years away?
Click here to see answer by ikleyn(52831)

Question 1064927: Speed of light is 3 x10^8 m/s. At this speed, how long a stars light will take if the star is 8 light years away?
Click here to see answer by Alan3354(69443)

Question 1065147: How would you factor this equation i have the answer (x+5)(x^2-5) I just don't know the process of factoring this polynomial. please and thank you
x^3+5x^2-5x-25
Click here to see answer by addingup(3677)

Question 1065179: True or false? If c*x= a and c is not equal to 0, then x= a over c
Click here to see answer by math_helper(2461)

Question 1065181: True or false? (a+c)*c= a
Click here to see answer by math_helper(2461)

Question 1065409: A chemistry teacher needs to mix a 30% salt solution with a 90% salt solution to make 20 qt of a 45% salt solution. How many quarts of each solution should the teacher mix to get the desired result?
30% salt solution _____ qt
90% salt solution ______ qt
Click here to see answer by ikleyn(52831)

Question 1065838: I am trying to factor this expression as if I did not know the form of a difference of squares.
Where is my error?
4x^2-49
4x^2 + 14x - 14x - 49
(4x^2 + 14x) + (- 14x - 49)
2x(x+7) + -7(x+7)
(2x-7)(x+7)
However (2x-7)(x+7) = 2x^2-49 not 4x^2-49
Where is my error?
Click here to see answer by Boreal(15235)

Question 1065746: so i have this math project and i need help: "write an equivalent expression in standard form for 2x-3(x-4y)+1/2(8x-11y) and then collect like terms, also express the answer for part (a) as an equivalent expression in factored form"
Click here to see answer by rothauserc(4718)

Question 1066453: -12 + (-4+9)
Click here to see answer by rfer(16322)

Question 1066480: The length and width of a rectangle whose length is 4 centimeters more than its width
I dont know how to solve it if I dont have the perimeter, please help!
Click here to see answer by ikleyn(52831)

Question 1066619: What is the multiplicative inverse of 3x
Click here to see answer by Boreal(15235)

Question 1066619: What is the multiplicative inverse of 3x
Click here to see answer by ikleyn(52831)

Question 1067487: complete the sqaure by finding the last term
x^2+3/4X+_______
Click here to see answer by Alan3354(69443)

Question 1067491: the sqaure root of x^2- 14x+49 is?

Click here to see answer by Alan3354(69443)

Question 1067493: solve for X by completeting the sqaure
x^2 + 8x -4 = 0

Click here to see answer by Alan3354(69443)

Question 1067493: solve for X by completeting the sqaure
x^2 + 8x -4 = 0

Click here to see answer by ikleyn(52831)

Question 1067495: asolve for X by completeting the square
x^2-10x+3=0

Click here to see answer by ikleyn(52831)

Question 1067489: complete the sqaure by finding the middle term

x^2+______+ 16/25

Click here to see answer by josgarithmetic(39623)

Question 1067619: rewrite 18m-(-5m-2) without parentheses
Click here to see answer by math_helper(2461)

Question 1067827: How to factorise: a^3+b^3+3a^2b+3ab^2
Any help is appreciated!
Click here to see answer by josgarithmetic(39623)

Question 1067827: How to factorise: a^3+b^3+3a^2b+3ab^2
Any help is appreciated!
Click here to see answer by ikleyn(52831)

Question 1067826: How to factorise: a^2-4b^2+a-2b
I know the answer, but please help me with a step by step solution!
Click here to see answer by josgarithmetic(39623)

Question 1068192: The length of a field in yards is a function f(n) of the length n in feet. Write a function rule for this situation.
f(n)= 3n
f(n)= n/12
f(n)=1/3n
f(n)= 12n
Click here to see answer by stanbon(75887)

Question 1068220: Simplify each expression
6(y+2)-6+5y
Click here to see answer by addingup(3677)

Question 1068221: Simplify each expression
1+1/2x-3/4(1/6-2/9x)
Click here to see answer by Lightning_Fast(78)

Question 1068360: Simplify expressions
N-4-9
Click here to see answer by Alan3354(69443)

Question 1068358: Simplify expressions
-9(6m-3)+6(1+4m)
Click here to see answer by Boreal(15235)

Question 1068356: -2n-(9-10n)
Click here to see answer by Lightning_Fast(78)

Question 1068676: I have attempted this problem multiple times and keep coming up with -28. I need help please.
p^2 + 2pq + q^2 where p = -4 and q = 2
Click here to see answer by Fombitz(32388)

Question 1068676: I have attempted this problem multiple times and keep coming up with -28. I need help please.
p^2 + 2pq + q^2 where p = -4 and q = 2
Click here to see answer by ikleyn(52831)

Question 1069019: 6�2 (1+2)
Click here to see answer by rfer(16322)

Question 1069069: What is 6and 7 more

Click here to see answer by Fombitz(32388)

Question 1069791: 5 more than the product of 9 and x

Click here to see answer by Fombitz(32388)

Question 1070332: a grocer wants to mix nuts which sell for Rs.14.40 per kilos with nuts selling for Rs.22.80 per kilos in order to make a mixture which sell for Rs.18 per kilos.how many kilos of Rs.14.40 per kilo nuts should be mixed with 30 kilos of Rs.22.80 per kilo nuts??
Click here to see answer by josgarithmetic(39623)

Question 1070330: the sum of the ages of a girl and her brother is 26 years.three years ago her age was four times the age of her brother.the find out the present ages of the girl and her brother??
Click here to see answer by josgarithmetic(39623)

Question 1070333: Mr. Akram invested Rs.55000 in shares of 2 different companies A and B.company A announced a dividend of 6% and company B of 8%.if the total income of the year received by Mr. Akram from these investments is Rs.3900.what were his investments in companies A and B??
Click here to see answer by josmiceli(19441)

Question 1071072: Place tge following numbers in ascending order
0.01,-1;0.1;0.9;1.1;-0.1

Click here to see answer by ikleyn(52831)

Question 1071214: I need to factories the following expression:
-5 (x-3y)^2 7(3y-x)
Click here to see answer by MathTherapy(10555)

Question 1071214: I need to factories the following expression:
-5 (x-3y)^2 7(3y-x)
Click here to see answer by josgarithmetic(39623)

Question 1071214: I need to factories the following expression:
-5 (x-3y)^2 7(3y-x)
Click here to see answer by Alan3354(69443)

Question 1071826: Simplfy the following
((12x^(-4)y^3z^(-5))/(4x^4y^(-3)z^5))^(-2)
Click here to see answer by Fombitz(32388)

Question 1072136: Write the statement for the problem in mathematical language. Use x for the tens digit and y for the unit digits in the two digit numbers.
The statement is ....
The number is...

Click here to see answer by ikleyn(52831)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840