Answer:
50
Step-by-step explanation:
let x = total DVD rentals
450=9x
450/9=x
50=x
50 DVDs were rented
The general way to work this out is to solve the general expression for
the remaining quantity versus half-life, using logarithms. But that's not
necessary with these numbers.
Look at the numbers:
-- 3 mg is 1/4 of 12 mg.
-- 1/4 is the product of (1/2) x (1/2).
-- So the 3 mg is what's left of 12 mg after 2 half-lives.
The 26 minutes must be two half-lives.
-- The half-life of that substance is 26/2 = <em>13 minutes</em>.
Go Maggie !
Function A is linear
y = 5/3x + 0
let me know if this is incorrect
I got y=2/3x + 10 , i hope that’s right!
