Tutors Answer Your Questions about Exponential-and-logarithmic-functions (FREE)
Question 935599: How to solve logarithmic trendline equations on Excel.
My equation is y = 0.2084ln(x) + 0.0782 and I need to find the value of x. my value for y is 0.088
I would be grateful if you could help me out.
Thanks in advance for the help.
Click here to see answer by LisaDrapeau(7)  |
Question 935743: So I am working on a story, and for it I need to know this answer to a problem my friend gave me. He told me to "simplify log4 of 128 - log4 of 8" and it means nothing to me as I am currently taking Geometry. Could you show me the steps to solve this so I can finish my story? It would be a great help!
Click here to see answer by MathLover1(20850)  |
Question 936000: A research assistant made 160 mg of radioactive sodium (Na^24) and found that there was only 20 mg left 45 h later.
(a) What is the half-life of Na^24?
(b) If the laboratory requires 100 mg of Na^24 12 hours from now, how much Na^24 should the research assistant make now? (Ignore the 20mg she currently has)
Click here to see answer by josgarithmetic(39620) |
Question 936359: I need help with this question.
1. Write the inverse equation of y=2^x+1 ( The x+1 is the exponent. I tried solving it and my answer was y^-1= lnx-ln2/ln2
b. Provide a table of values of y=2^x+1 and its inverse. (I will know how to do this if you can help me with the first part)
c. What are the asymptotes for each graph? Be sure to identify if it is horizontal or vertical. (The question wants the asymptote for y=2^x+1 and the asymptote for the inverse of y=2^x+1
Click here to see answer by josgarithmetic(39620) |
Question 936473: how do you find the inverse of a logarithm function
my problem question is y=4log3(x)+1
the base or small number in the log function is 3
i know you have to substitute x for y when you are doing the inverse and i got to the step x= 4log3(y)+1 but i am stuck on what to do after you substitute it.
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 936473: how do you find the inverse of a logarithm function
my problem question is y=4log3(x)+1
the base or small number in the log function is 3
i know you have to substitute x for y when you are doing the inverse and i got to the step x= 4log3(y)+1 but i am stuck on what to do after you substitute it.
Click here to see answer by stanbon(75887) |
Question 936464: Solve for x and y:
x^2 + y^2 = 17
y-1=x
There are two solutions: (x1, y1) and (x2, y2)
Evaluate: x1+y1+x2+y2=
A. 2 sqrt19
B. 0
C. -2-2 sqrt19
D. 2
E. none of these
(from there are two solutions and the evaulate problem under it, the x1, y1 and x2, y2 are all not exponents but logs)
Click here to see answer by josgarithmetic(39620) |
Question 936566: A woman walks 200 yards west along a straight shoreline and then swims 50 yards north into the ocean on a line that is perpendicular to the shoreline. Using her starting point as the pole and the east direction as the polar axis, give her current position in polar coordinates. Round the coordinates to the nearest hundredth. Express angle in degrees.
Click here to see answer by TimothyLamb(4379)  |
Question 936740: Is this function for exponential growth or decay? Find the constant percentage rate of growth or of decay.
ƒ(x) = 5 • 1.08x
Select one:
a. Exponential decay; 108%
b. Exponential growth; 108%
c. Exponential growth; 8%
d. Exponential decay; 8%
Click here to see answer by oscargut(2103)  |
Question 922296: The decay of 601 mg of an isotope is described by the function A(t)= 601e^-0.019t, where t is time in years. Find the amount left after 34 years. Round your answer to the nearest mg. show all work for full credit.
Click here to see answer by tommyt3rd(5050)  |
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