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

Tutors Answer Your Questions about Exponents (FREE)

Question 174804: what is the illegal values of b in the fraction 2b^2+3b-10 over b^2-2b-8?
Click here to see answer by ankor@dixie-net.com(15746)

Question 174802: What is the expression of a^3b^2 over a^2b
Click here to see answer by Alan3354(31509)

Question 174929: 8+4-3
Click here to see answer by checkley75(3666)

Question 174985: Please answer the above question so we can check our answer while studying for finals
Click here to see answer by Alan3354(31509)

Question 175574: 6x10(4 exponent)
2x10(-5 exponent)
is equal to 3x10 (9 exponent)
and is equal to 3,000,000,000
my question:
why isn't the exponent a negative 9 on 3x10 (9 exponent)? and why are we not using a decimal point here like we would in example:
8x10 (-9 exponent)
4x10 (3 exponent)
is equal to 2x10(-12 exponent)
is equal to 0.000000000002
Click here to see answer by Fombitz(13828)

Question 175572: -11 6 -5 -4
(4X10 ) X (7X10 = 28X10 - 2.8X10 =0.00028
MY QUESTION:
-4
HOW HAS A DECIMAL PIONT GET (2.8) THERE AND WHY HAS THE EXPONENT (10 ) DECREASED?
Click here to see answer by stanbon(57953)

Question 175573:
8X10 (-9 exponent)
IS EQUAL TO 2X10 (-12 exponent) and is also EQUAL TO 0.000000000002
4X10 (3 exponent)
MY QUESTION:
I THOUGHT THAT DURING DIVISION I NEEDED TO SUBTRACT THE EXPONENT, IN THE EXAMPLE IT HAS ADDED IT, WHY? AND HOW DO I KNOW WHERE TO PUT THE DECIMAL POINT, AND WHERE THE DECIMAL POINT COME FROM?
Click here to see answer by stanbon(57953)

Question 175571: (5x10(EXPONENT-8) x (3x10(EXPONENT14)) = 15x10(EXPONENT6) = 1.5X10(EXPONENT7)=15,000,000
(SORRY I DON'T KNOW HOW TO TYPE EXPONENTS)
MY QUESTION:
HOW DID THE PROBLE GET A DECIMAL PIONT (1.5) AND WHY HAS THE VALUE OF THE EXPONENT INCREASED BY ONE?
Click here to see answer by stanbon(57953)

Question 175299: I have a story problem that consists of 2 parts. I can't even begin to figure out the first part so I definately cannot figure out the second. I was hoping there would be someone to help me out. Here is the problem:
The weight of an object follows this equation: w=Cr<-2> (the negative 2 is an exponent) where C is a constant, and the r is the distance that the object is from the center of the earth.
1. Solve the equation w=Cr<-2> for r.
2. Suppose that an object is 100 pounds when it is at sea level. Find the value of C that makes the equation true. (Sea level is 3,963 miles from the center of the earth)
Please help.
Click here to see answer by ptaylor(2052)

Question 176124: (4x10^-11)x(7x10^6)=28x10^-5=2.8x10^-4=0.00028
my question:how does the decimal point get there (2.8) and why has the exponent (10) been decreased?
Click here to see answer by Fombitz(13828)

Question 176258: 49.5*10 to the fourth power.
Click here to see answer by stanbon(57953)

Question 176266: I need help solving (2x+8)^(1/2)-8=0.
Could you please help me?
Click here to see answer by Alan3354(31509)

Question 176713:
Click here to see answer by Mathtut(3670)

Question 176858: How would you expres:w^4 * w * w^3 as a single power of w?
Click here to see answer by Mathtut(3670)

Question 176864: How would you simplify a^2b/a^5b^3? Thanks so much.
Click here to see answer by Mathtut(3670)

Question 176864: How would you simplify a^2b/a^5b^3? Thanks so much.
Click here to see answer by Edwin McCravy(8999)

Question 177225: Find all real or imaginary solutions to each equation.
Use the method of your choice.
3y^2 + 4y - 1 =0
thank you
Click here to see answer by nerdybill(7003)

Question 177224: Find all real or imaginary solutions to each equation.
Use the method of your choice.
3y^2 + 4y - 1 =0
thank you
Click here to see answer by nerdybill(7003)

Question 177404: (9*10^12)/3
Click here to see answer by Mathtut(3670)

Question 177412: simplify
6*(7.25*10^26)
Click here to see answer by Fombitz(13828)

Question 177442: My daughter missed this class friday and has a final monday morning..can you please show how to get answer and correct answer? A 20g sample of a radioactive substance has a half life of 28 days.
a. how much of the sample is left after one year?
b. how many days will it take for the sample to reach 1 gram?
Thank you for your help!
Click here to see answer by stanbon(57953)

Question 177441: My daughter missed this class friday and has a final monday morning..can you please show how to get answer and correct answer? Superman has a violent reaction to red kryptonite which decays into green krytonite with a half life of 5 hours. Red Kryptonite is no longer dangerous to Superman when 90 percent of the red kryptonite has decayed.
a. What percent of the kryptonite is left after one day?
b. how long before the red kryptonite has decayed 90 percent and is safe for superman?
Thank you for your help!
Click here to see answer by Fombitz(13828)

Question 177349: Simplify
-x^2y^2
---------
x^1/2 y^0
Click here to see answer by Fombitz(13828)

Question 177598: Add the polynomials - The problem is: (9xcubed-xsquared-x-1/3)+(xcubed+xsquared+x+4/3). I know I need to clear the fractions first, and when I do that I do not get the right answer. Can you please help? Thank you!
Click here to see answer by solver91311(17072)

Question 177604: 1.The sun's mass is approximately 332,999 Earth's masses.Calculate its mass in kg by calculating 333,999*(5.979*10^24).
2.Sometimes scientist use the mass of the Earth as the unit for describing the mass of other astronomical bodies.One Earth Mass is approimately 5.979*10^24 kg.Jupiter's mass is approximately 318 Earth masses.Calculate Jupiter's mass in kg by calculating 318*(5.979*10^24).

Click here to see answer by stanbon(57953)

Question 177656: Help solve please:
-(4a^4b^7)^3
Click here to see answer by stanbon(57953)

Question 168384: I need help solving this problem. t^2+4*t+3/t+1
Click here to see answer by solver91311(17072)

Question 177666: simplfy
(1.75*10^12)/0.25
Click here to see answer by user_dude2008(1861)

Question 177655: Help solve please:
(u^5z^8)/(z^-5u^-4)
Click here to see answer by user_dude2008(1861)

Question 177659: (6x^5y^2z^-4)/(4x^-2y^4z^-1)
Click here to see answer by user_dude2008(1861)

Question 177652: Help solve please:
(2)^0/3
Click here to see answer by user_dude2008(1861)

Question 177658: [(9a^3)/(10b^4)]^-2
Click here to see answer by MathTherapy(1480)

Question 177704: what is the value of x?
4^20+4^20=2^x
Click here to see answer by EMStelley(187)

Question 177651: Please help me with this:
[(6x^5y^3z)*3x^2]/(2xy^2z^5)
Click here to see answer by gonzo(654)

Question 177670: 1.Saturn's mass is approximately 5.684*10^26 kg. Find Saturn's mass in Earth Masses by calculating (5.684*10^26)/(5.979*10^24).

simplfy
2.(1.75*10^12)/0.25

Click here to see answer by MathTherapy(1480)

Question 170919: 20xy2+4xy-15xy2-3xy-5xy2
Click here to see answer by cartert(27)

Question 178663: five eiths times negative forteen fifteenths.

Click here to see answer by Mathtut(3670)

Question 179002: Suppose an economy's real GDP is $30,000 in year 1 and 31,200 in year 2. What is the growth rate of its real GDP? Assume that population is 100 in year 1 and 102 in year 2. Whar is the growth rate of GDP per capita?
Click here to see answer by Mathtut(3670)

Question 179418: Find the product of the cube of (-3/4) and square of (2/-3).
Click here to see answer by jim_thompson5910(28704)

Question 179411: 5 to negative two power times 5 to the second power
Click here to see answer by jim_thompson5910(28704)

Question 179508: Can you help me with this problem?
Solve by elimination: -5y+2x=4
-0.02y+0.03x=0.04
Thanks
Click here to see answer by Alan3354(31509)

Question 179542: rewrite with a rational exponent
7 square root of 18
Click here to see answer by jim_thompson5910(28704)

Question 180154: solve the equation 3 /(x-4) + 5 / (x+4) = 7x / (x^2 -16)
Click here to see answer by checkley77(12569)

Question 180154: solve the equation 3 /(x-4) + 5 / (x+4) = 7x / (x^2 -16)
Click here to see answer by eperette(173)

Question 180154: solve the equation 3 /(x-4) + 5 / (x+4) = 7x / (x^2 -16)
Click here to see answer by solver91311(17072)

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