Questions on Algebra: Exponents and operations on exponents answered by real tutors!

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Question 52917: 1)the exam scores are:
70 65 85 80 70
if the mean of the 3 highest scores represents 65% of their grade and the final exam is 35% of their grade,what is the range of grades in order to achieve a C in the course. round your final answers to the nearest whole number.remember the highest possible grade on the final is 100.
2)Can this student get an "A" if the highest possible score on the final exam is 100? Assume that the grade ranges are:
A 90 100
B 80 89
C 70 79
D 60 69
Click here to see answer by ankor@dixie-net.com(22740)

Question 53035: how do I know if I need to have a positive number or a negitive ( im doing negitive exponents )
Click here to see answer by checkley71(8403)

Question 53192: pls. help can't find
Which of the following statements is not true?
a. Exponents distrubute over addition.
b. Multiplication distributes over subtraction.
c. Exponents distribute over multiplication.
d. Multiplication distributes over addition.
Click here to see answer by aaaaaaaa(138)

Question 53376: When solving the following for x, I get 5. However, the review sheet I'm working with says I should get 25/8. I can't find how they got that answer and I think my problem lies in manipulating the exponents.
50=[((x)^0.5)+((9x)^0.5)]^2
Thanks
Click here to see answer by stanbon(75887)

Question 53378: (3x^2)^3(2/3x^-1y)^2
The problem reads...The quantity (three x squared) raised to the third power multiplied by the quantity (two third x raised to the negative one power y) squared.
I need to simplify I keep getting 3x^44y^2 (three x raised to the fourth power four y squared) but that is not right.
Click here to see answer by stanbon(75887)

Question 53198: The set of positive real numbers is closed under which operation(s)?
is it multiplication
HELP!
Click here to see answer by rapaljer(4671)

Question 51896: 2 to the 3rd power? answer
Click here to see answer by math_iz_hard(8)

Question 53580: x3 x=-5
Click here to see answer by rchill(405)

Question 53822: how do u fin the equivelant to the exponent like 2 to the power of 20 over 2 to the power of 4
Click here to see answer by stanbon(75887)

Question 53803: What does a 0 exponent mean (as in X to the zero power)?
Click here to see answer by scoop(27)

Question 53837: sqrt (5^2-4(2)(-3))
Click here to see answer by checkley71(8403)

Question 53860: This is more of a proceedural question.
My daughters teacher has taught them that -3^2=-9 while -(3^2)=9
And it states in the text on page 83 section 17.B this is the case.
I have been always taught that two negatives equal a positive.
Is this "new" math? Or am I mis-remembering
Thank You for any help you may provide
Robert
Click here to see answer by Earlsdon(6294)

Question 53656: [7+7 (5-3)]2/3
Click here to see answer by stanbon(75887)

Question 54120: (ab4)(ab2)
Click here to see answer by funmath(2933)

Question 53832: what do they want when it says simplify and what does the "and" mean in the question
Click here to see answer by funmath(2933)

Question 54125: what is the prime factorization of 1,700
Click here to see answer by music974(43)

Question 54163: At 1pm Tom leaves home on his bike heading to Sue's house at 9mph. An hour later, Sue leaves her house biking to Tom's at 6mph. Their houses are 39 miles apart. At what time will the meet?
Click here to see answer by stanbon(75887)

Question 54222: x^-1.5=27 . . . . . . I know that the answer is 1/9, but I have no idea how to get there.
Click here to see answer by funmath(2933)

Question 54222: x^-1.5=27 . . . . . . I know that the answer is 1/9, but I have no idea how to get there.
Click here to see answer by checkley71(8403)

Question 52914: determine which of the following relations is also a function.if the given relation ia a function then indicate the domain and range of the function using set notion such as={2,5,6,10,11},range={8,4,1,1,0}
1.{(-1,10),(3,7),(4,5),(-6,3),(3,-6),(1,-10),(9,-4)}
2.{(-2,9),(10,9),(-6,6),(8,-10),(7,-1),(-2,-5)}
3.{(-10,-2),(-1,10),(6,-9),(5,10),(-7,8)(5,-6),(-3,7),(1,-9)}
4.{(8,8),(3,-2),(-6,-3),(-4,-1),(_4,4),(1,-6),(9,-2)}

Click here to see answer by venugopalramana(3286)

Question 54344: What is the awnser to this problem? 5(11 + 22 - 10) – 19
Click here to see answer by funmath(2933)

Question 54344: What is the awnser to this problem? 5(11 + 22 - 10) – 19
Click here to see answer by Destionay(3)

Question 54467: Simplify.
x^-2y^3
Click here to see answer by funmath(2933)

Question 54484: What is the difference between negative numbers in parenthesis with an exponent outside the parenthesis and a negative number with an exponent with no parenthesis ?
(-2)^2
or
-2^2
Click here to see answer by checkley71(8403)

Question 54563: x^2=25,other than trial and error,how does one solve for x
Click here to see answer by stanbon(75887)

Question 54824: simplify: 6^6+6^6+6^6+6^6+6^6+6^6 (Leave your answer in the exponential form.)
Click here to see answer by stanbon(75887)

Question 54948: I am stuck on correct answer for:
if x = 3 and y = -2, then -xy^2 =
I believe the answer is -12, am I correct? If not, what is correct answer?
I am not using any specific book. I am just practicing...

Click here to see answer by Professor Goode(3)

Question 54947: I am stuck on correct answer for:
one of the factors of x^2 + x - 6 is:
I believe the answer is x + 3, am I correct? If not, what is correct answer?
I am not using any specific book. I am just practicing...
Click here to see answer by Professor Goode(3)

Question 54946: I am stuck on correct answer for:
(y - 3x)^2 =
I believe the answer is y^2 - 6xy - 9x^2, am I correct? If not, what is correct answer?
I am not using any specific book. I am just practicing...
Click here to see answer by Professor Goode(3)

Question 54945: I am stuck on correct answer for:
(1 - 0.7) - 7.47 =
I believe the answer is -7.17, What is correct answer to this?
I am not using any specific book. I am just practicing...
Click here to see answer by jenrobrody(19)

Question 54942: I am stuck on correct answer for:
9x - 7y - x + 4y =

I believe the answer is 8x - 3y. What is correct answer to this?
I am not using any specific book. I am just practicing...
Click here to see answer by rapaljer(4671)

Question 54944: THE ECONOMY OF A DEVELOPING COUNTRY IS BASED ON AGRICULTURAL PRODUCTS , INDUSTRIAL PRODUCTS AND MINING PRODUCTS . AN OUTPUT OF ONE TON OF AGRICULTURAL PRODUCTS REQUIRES AN INPUT OF 0.1 TON OF AGRICULTURAL PRODUCTS , 0.01 TONS OF INDUSTRIA PRODUCTS , 0.02 TONS OF MINING PRODUCTS . AN OUTPUT OF ONE TON OF MINING PRODUCTS REQUIRES AN INPUT OF 0.01 TON OF AGRICULTURAL PRODUCTS ,0.05 OF INDUSTRIAL PRODUCTS AND 0.13 OF MINING PRODUCTS . ONE TON OF INDUSTRIAL PRODUCTS REQUIRED AN INPUT OF 0.04 OF AGRICULTURAL PRODUCTS , 0.15 OF INDUSTRIAL PRODUCTS , AND 0.03 OF MINING PRODUCTS .
QUESTION :
1)Find the necessary gross productions to provide surplusses of 2300 tons agricultural , 3000 tons of industrial products and 4500 tons of mining products

2)distribute the gross production among derived and independent demands
Click here to see answer by jenrobrody(19)

Question 54783: The function is written in long form to describe a visual branching problem-- a center star with three points, each of those branching to three points, etc.
For n=1, total points (x) = 1
For n=2, total points (x) = 1 + 3
For n=3, x = 1 + 3 + 3 squared
For n=4, x = 1 +3 + 3square + 3 cubed
So the last number in the sequence is always 3 with an exponent of (n-1)
Short of brute force with a calculatorm how would I calculate x for n=100?
How would I write the formula?
Click here to see answer by stanbon(75887)

Question 55050: (-3a^2b)(2a^2b^3)^3 Please help
Click here to see answer by funmath(2933)

Question 55154: Divide. x^4+x^2-80 from x+3. I get stuck on the +3 part of the division.
Click here to see answer by ankor@dixie-net.com(22740)

Question 55227: please help
simplify
(3x^-2y)(2x^-3y^-2)
Click here to see answer by funmath(2933)

Question 51731: (32a^9)(4a^-2)/ 128a^2 I am having a real problem with that question because I dont go to a regular school where I am taught a lesson. I go to an alternative school and they just give me the work and expect me to know it. If you could please help me understand it I would really appricate it.
Click here to see answer by piyu(4)

Question 55450: I am suppost to simplify the following and execute all multiplication and division: (x+3)^3
This is what I have: x^3+9x^2+27x+27 not sure if it is right
Thanks, Lackinmath
Click here to see answer by Cintchr(481)

Question 55442: I'm stmped on this one!
I am suppose to simlify the, using positive exponents only, and be sure to execute all multiplication and division.
(4x^2-4x+3)/(x-2) This is what I have:-2x^2+6x+3/y-5/2 for my final answer
Thanks, Lackinmath
Click here to see answer by ankor@dixie-net.com(22740)

Question 55681: I am trying to solve for a "to the power of x" equation using a scientific calculator.
I have started with an example for which I know the answer
How do you use a calculator to solve for, for example:
5 to the power of x = 125
Solve for x.
I know x =3 but how do you get the calculator to tell you this!
Ultimately I want to know how to solve for
0.5 = 1 - e to the power of (-8.9*t)
Solve for t.
Calculator crazy,
Heather
Click here to see answer by Earlsdon(6294)

Question 55590: Trying to help my son, but has been too long!
Please help me solve
From TAKS (Texas) test practice worksheet.
Click here to see answer by Genius(17)

Question 55726: 3x^-2
Click here to see answer by funmath(2933)

Question 55725: 10^-4
Click here to see answer by funmath(2933)

Question 55745: We are able to convert to basic scientific notation but the confusion is coming in when an exponent is given in a number such as 300,000^2 or when asked to give the scientific notation for 800^4-400^2 Thanks!
Click here to see answer by stanbon(75887)

Question 55987: What is the answer to this exponent problem.
(0)2 is it zero?
Click here to see answer by funmath(2933)

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