Questions on Algebra: Exponent and logarithm as functions of power answered by real tutors!

Tutors Answer Your Questions about Exponential-and-logarithmic-functions (FREE)

Question 545538: log base7 (3x-11)=2
Click here to see answer by stanbon(57246)

Question 545747: 1/2^-5
Click here to see answer by saifoo.khan(162)

Question 545825: log2 256=x
Find the value of x
Click here to see answer by vleith(2825)

Question 546378: -6m^2(3mn+13m-5n)
Click here to see answer by saifoo.khan(162)

Question 546826: Find the exact soulution to each equation:
3log(x)=log(x)
What I have so far:
log( )= log(x)
Click here to see answer by Earlsdon(6287)

Question 546806: given that the half life of a certain radioactive substance s 20 days and there are 5 grams present initially, the equation that models the situation is s(t)=5(1/2)^t/20. Find the time when here will be 1 gram of the substance remaining
Click here to see answer by KMST(1868)

Question 547517: Find the slope of the line the contains the points (6,-8) and (-2,-4)
Click here to see answer by mananth(12270)

Question 547568: What is 16, base 2?
What does base 10 mean..like 1,000,000 base 10
Click here to see answer by unlockmath(1599)

Question 547874: given x=-1,0,1,2,3 and F(x)=3,6,12,18,30 determine if this is an exponential function and identitfy the value of base a..Hint look at the ratio of consecutive values
I can get base a on my calculator but I am not sure how to perform the ratio of consecutive values
Click here to see answer by stanbon(57246)

Question 547930: Please help me solve this equation: ( 1/4 * ( sqrt ( 6 ) * sqrt ( 3 ) )
Click here to see answer by josmiceli(9661)

Question 548116: Magnitude of a star is modeled by M=6-5/2logI/Isubscript o.
Determine the ratio of light intensities between a star of magnitude 1 and a star of magnitude 3.
I need help to even try to get started on this problem. I do not understand it at all and there is really ni help in the book.

Click here to see answer by stanbon(57246)

Question 253874: beryllium-11 decomposes into boron-11 with a half life of 13.8 seconds. How long will it take 240 g of beryllium-11 to decompose into 7.5g of beryllium-11?
based on the forumula provided in the text book C(t)=C(0)2e^-t/h
where C(0) = 240, C(t)=7.5 ,h=13.8
7.5/240=2e^-t/13.8
this was a s far as i got
Click here to see answer by martin.jabou(1)

Question 548456: Magnitude of a Star
The magnitude M of a star is modeled by:
M=6-5over2 log I over I subscript 0
Where I subscript 0 is the intensity of a just visible star and I is the actual itensity of the star being measured. The dimmest stars are of a magnitude 6, and the brightest are of a magnitude 1. Determine the ratio of light intensities between a star of magnitude 1 and a star of magnitude 6.
NOTE: 5 over 2 is a fraction and I over I subscript 0 is a fraction. The log is inbetween both fractions.
I really need help with this problem as I cannot even know where to begin on it. I would greatly appreciate the help.
Click here to see answer by KMST(1868)

Question 547233: What is as a single function?
Click here to see answer by lwsshak3(6469)

Question 548837: I have a problem like 7 ^ log base 7 x. The question asks me to Simplify the expression using inverse properties. How would I go about doing so?
Click here to see answer by lwsshak3(6469)

Question 543066: how would you solve log 100 (^10^log10^12)
Click here to see answer by lwsshak3(6469)

Question 549042: 9x + 5 - 4x= -20
Click here to see answer by mathie123(224)

Question 548234: e^{1.273*(75)-4.705} (0.83293)
Click here to see answer by KMST(1868)

Question 549396: how do you solve this equation:
five to the power of 2x divided by five to the power of 2x + 1
Click here to see answer by Alan3354(30983)

Question 549407: inverses of functions:
Evaluate if F(x)=3x+7
what is f(6)?
Click here to see answer by stanbon(57246)

Question 549463: What is the remainder if 2^2011 is divided by 5?
Click here to see answer by Alan3354(30983)

Question 549429: Simplify: (2x+1)(x^2+5x-3)
Click here to see answer by mananth(12270)

Question 549847: You invest $800 in an account with an annual interest rate of 3.2%, compounded annually. How much in in the account after 15 years? Round your answer to the nearest whole number
Click here to see answer by jim_thompson5910(28504)

Question 549870: How do I make the equation y=ab^x with two points, (5,4) and (7,9)?
Click here to see answer by stanbon(57246)

Question 549870: How do I make the equation y=ab^x with two points, (5,4) and (7,9)?
Click here to see answer by Alan3354(30983)

Question 550094: Solve: x2-20x+100=0
Click here to see answer by mathstutor458(57)

Question 550096: complete the trinomial such that it's a perfect square: y=x2+_x+81
Click here to see answer by stanbon(57246)

Question 550097: find the discriminant of y=x2-3x-5
Click here to see answer by stanbon(57246)

Question 550097: find the discriminant of y=x2-3x-5
Click here to see answer by mathstutor458(57)

Question 550095: simplify: 15-5i2+3i32
Click here to see answer by stanbon(57246)

Question 550093: find the minimum value of y=x2-22x+132
Click here to see answer by stanbon(57246)

Question 550116: When several boys tried to divide a sum of money by giving 10 dollar to each boy,7 boy got nothing.when each boy took 9 dollar,the had 7 dollar left over.what is the sum of the number of money and the number of boys?
Click here to see answer by ankor@dixie-net.com(15638)

Question 550115: Find the constant term of the expansion of (x^-2+x^3)^15
Click here to see answer by stanbon(57246)

Question 550298: if f(x)=x^2 and g(x)=x-3 find (f o g) (0).
Click here to see answer by oberobic(2304)

Question 550300: four consecutive #'s subtract to be -50. What is the third number?
Click here to see answer by Alan3354(30983)

Question 550291: simplify: 15-5i^2+3i^32
Click here to see answer by TutorDelphia(193)

Question 550304: put this conic section in standard form. What is the a^2 value? 25x^2+16y^2+150x=160y-225
Click here to see answer by lwsshak3(6469)

Question 550303: Find the hole in this f(x). y=3x-48/2x^2-29x-48
Click here to see answer by lwsshak3(6469)

Question 550290: simplify: 15-5i^2+3i^32
Click here to see answer by Alan3354(30983)

Question 550297: solve: (2x+8)^1/2-8=0
Click here to see answer by Alan3354(30983)

Question 550292: complete the trinomial such that it's a perfect square: y=x^2+__x+81
Click here to see answer by Alan3354(30983)

Question 550307: solve e^x/9-8=6. Add 2.248 to the value of x. Round to the nearest whole number.
Click here to see answer by stanbon(57246)

Question 550305: solve 7-2^x=-1. Add 24 to the value of x.
Click here to see answer by prateekagrawal(56)

Question 550296: solve: square root(x-3)+5=x
Click here to see answer by mananth(12270)

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