Questions on Algebra: Negative and Fractional exponents answered by real tutors!

Tutors Answer Your Questions about Exponents-negative-and-fractional (FREE)

Question 41129: 3/4 / 4/5
Three fourths divided by four fifths. Is it 3/5?
Click here to see answer by fractalier(2101)

Question 41126: Solve x^2=-6x
SI the answer 6, -6?
Click here to see answer by fractalier(2101)

Question 41133: Simplify: a to the square root of 8 - 3 to the square root of 2a^2
Click here to see answer by fractalier(2101)

Question 41152: solve by factoring:

Click here to see answer by zeynep(43)

Question 41145: Someone please help me solve these two problems!!!Please!
Section a.
A jar contains 13 black and 12 red marbles. If one marble is drawn at random, what is the probability that it is black?
Section b.
If two marbles are drawn randomly from the jar in section a., what is the probability that the first is red and the second is black if the marbles are drawn....
a.with replacement?
b.Without replacement?
Click here to see answer by mszlmb(115)

Question 41150: Can someone help me?
Click here to see answer by PaulAllen65270(19)

Question 41148: Solve by the quadratic formula. What is the answer?
Click here to see answer by PaulAllen65270(19)

Question 41499: I need help, The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The formula for the U.S. is
p(in millions)= 250 x 2^(y-1990)/66

What will the population of the United States be in 2025 if this growth rate continues?
I get to the point of being able to substitute y for 2025 but when I subtract 2025-1990 and then divide by 66 I get .9848484848 and so on. I'm not sure what to do at this point. Can you help me figure this out.
Click here to see answer by stanbon(57205)

Question 41464: (-2/3)+p=1/6
show work
Click here to see answer by zeynep(43)

Question 41547: I need to solve for x
5(x - 3/4)
I have no clue how to do this
Click here to see answer by AnlytcPhil(1276)

Question 41768: 27^3n-1 = 81^ -n
Click here to see answer by longjonsilver(2297)

Question 41871: I am finishing high school from home. My school name is penn foster.
my questions is
reduce fraction w squared +5w+6 over w squared-w-12
Click here to see answer by longjonsilver(2297)

Question 41870: I am doing school from home. The name of my school is penn foster.
Reduce fraction 6x/12x to lowest terms.
My answer was 1/2 but was not right.
Click here to see answer by fractalier(2101)

Question 42009: divide 40x by 5x over 64y by 8y
home school. education direct
my answer 25x over 64y
Click here to see answer by checkley71(8403)

Question 42011: home school. education direct
r+5 by r squared+4r-21 over
______________________
r squared+5r-14 by r-2
Click here to see answer by Fermat(127)

Question 42206: -2/3(6-3x)-18
Click here to see answer by fractalier(2101)

Question 42281: a to the -5 times b to the 4 times c to the -2 times d. how do i rewrite this using positive eponents?
Click here to see answer by tutorcecilia(2152)

Question 41654: I saw a similar problem posted but am not sure of the solution to this one. Can someone help?
16^3/2
I got the answer as 6, because 16 = 4^4 and 4 times 3/2 = 12/2 =6 am I right? If not can someone please explain? Thanks.

Click here to see answer by Nate(3500)

Question 42750: Graph:
Click here to see answer by ichudov(499)

Question 42753: The amount of Apples (I) is inversely proportional to the amount of Potatoes (A).
section A. Write a general equation that summarizes this relationship.
Section B. When 52 pounds of Potatoes produces 13 pounds of Apples, what is the constant of proportionality?
Section C. How much Potatoes would be needed to produce 10 pounds of Apples?
Click here to see answer by Nate(3500)

Question 42787: Can you please help me simplify 1/(3)^-5 ? Thanks!
Click here to see answer by aaaaaaaa(138)

Question 42798: I need help with this problem 3A/7 = -2/5

Click here to see answer by fractalier(2101)

Question 42748: Someone please help me solve this!!!
Click here to see answer by fractalier(2101)

Question 42752: Solve.
Click here to see answer by PaulAllen65270(19)

Question 42749: solve and graph: , D={integers}
Click here to see answer by fractalier(2101)

Question 43148: what is 6 to the 0th power

6^0= ?
Click here to see answer by stanbon(57205)

Question 43203: 3/4x-1/2=1 solve as an equation
Click here to see answer by fractalier(2101)

Question 43360: xym-3ymx-4xmy-3my+2ym
Click here to see answer by fractalier(2101)

Question 43468: Can someone please help me on this one?
I have to simplify.
(-8)^-4/3
The 8 is to the -4/3 power. Does that make sense?
Thanks
Click here to see answer by aaaaaaaa(138)

Question 44146: How do you do this?
-(x2+y)=
Click here to see answer by adamchapman(301)

Question 44963: If $8000 isinvested in a long-term trust fund with an interest rate of 9% compounded continously, what is the amount of money in the account after 20 years?
Click here to see answer by adamchapman(301)

Question 45470: Please write without negative exponents.
(z^2)^-4

Thanks
Click here to see answer by Nate(3500)

Question 45470: Please write without negative exponents.
(z^2)^-4

Thanks
Click here to see answer by checkley71(8403)

Question 45471: Simplify:
2w^-6w^6z^6y*2z^5*3y^-6
Write your answer without using negative exponents.

I'm coming up with 12z^11 but I'm not sure if this is correct. help please
Click here to see answer by stanbon(57205)

Question 45791: REPOST: I posted this last week and got 2 different answers from different tutors, so I'm hoping the third time might get me the correct answer.Simplify the following:

a^3b^2/a^4b

When I tried it I got b^-1, but the tutors posted different answers from those. HELP! This is due tonight.
Click here to see answer by Nate(3500)

Question 46268: (-5) to the 4th power
Click here to see answer by Nate(3500)

Question 46416: evaluate the base 128 raised to the positive 2/7th power. Write the answer in exact form.
Click here to see answer by tutorcecilia(2152)

Question 46763: The amount in an account after t years from an initial principle P invested at an annual rate r compounded continuously is given by A=Pe^(rt) where r is expressed as a decimal. Solve this formula for t in terms of A,P and r.
i get that t=r ln(A/P)

Click here to see answer by Nate(3500)

Question 46762: the decibel level of sound is given by D= 10 log (I/10^-12), WHERE I is the sound intensity measured in watts per square meter. Find the decibel level of a
whisper at an intensity of 5.4 x 10-^10 watts per square meter.
so does that mean:
D= 10 log (5.4 x 10^-10)/ 10^-12)
do you subtract the exponents to get
so pluggin 5.4 x 10^-10 in a calculator i got 6.798
and 10^-12 I got 1.318
divide the two 6.798/1.318= 5.158
d=10 log (5.158) except that isn't one of my choices so i know i am wrong somewhere.
a. 2.73 decibels
b. 3.73 decibels
c. 27.3 decibels
d. 37.3 decibels

Click here to see answer by Nate(3500)

Question 46755: the population P of a certain culture is expected to be given by a mdoel P=100e^(rt) where r is a constant to be determined and t is a number of days since the original population of 100 was established. Find the r value if the population is expected to reach 200 in 3 days.

Click here to see answer by Nate(3500)

Question 46942: detemine the value of expresion
5^3-27=
7^77-7^76=
Click here to see answer by stanbon(57205)

Question 47015: 2x^3-3x^2+5x when x=-3
Click here to see answer by venugopalramana(3286)

Question 47137: the cost of holding a concert is the sum of the fixed cost, which is the same no matter how many people attend, and the variable cost, which depends on the number of people attending. If the total cost for a concert attended by 1000 people is $75000, and the total cost of a concert attended by 1200 people is $85000, what is the number of dollars in the fixed cost when holding a concert?
Click here to see answer by checkley71(8403)

Question 47153: Problem:Change the sign to an equivalent fraction: -a + 2b over 2x - y. Do I change the entire fraction to a neg. and change the sign in the numerator (-a + 2b) to (a - 2b)?

Click here to see answer by pizza(14)

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