Thursday

January 29, 2015

January 29, 2015

Posted by **Jake** on Sunday, February 19, 2012 at 5:55pm.

- Math -
**bobpursley**, Sunday, February 19, 2012 at 6:08pmthere is a difference of x=+4 between 5, 9

There is a multiply difference of 14/20=.7 between the two.

f(13)=14*.7

f(17)=14*.7*.7

f(21)=14(.7*.7*.7)

- Math -
**Reiny**, Sunday, February 19, 2012 at 6:09pmlet f(x) = a(b^x) or

y = a(b^x)

given: when x=5, y=20

20 = a b^5

given: when x=9, y=14

14 = a b^9

divide the 2nd by the first:

b^4 = 14/20 = 0.7

b = (0.7)^.25 = appr .91469

sub into 20 = a b^5

20 = a(.91469)^5

a = 31.236

f(x) = 31.236 (.91469)^x

f(13) = 31.236(.91469)^13 = 9.8

you do the button-pushing for the rest

Note, I used the memory locations of my calculator to store all the supplied decimal values for both a and b

**Answer this Question**

**Related Questions**

math-5 - Which choice is the answer? Show me please. Tara spent 3 hours doing ...

Distributive property - How would I multiply these expression? 6(h-4) -3(x+8) -...

Math question? :c - Use the Distributive Property to multiply. Show all steps. 7...

Math - Let f(t) be an exponential function with f(0) = 11 and f(4) = 59. Use the...

algebra 2 - It says to: Use the Distributive Property to show that the following...

Calculus - Given y=log(x), what is dy/dx? If you have to derive this from first ...

math-5 - Tara spent 3 hours doing homework. She spent 1/3 of her time on math, ...

5th Grade math - What is a partial-products algorithm. For example 87*65=? How ...

math - 1.Transform the graph of f(x) = 3^x to sketch g(x) = 3^-(x+1) -2. Show ...

math - 1.Transform the graph of f(x) = 3^x to sketch g(x) = 3^-(x+1) -2. Show ...