2/9 × 3 =
= 2×3 / 9 =
= 6/9 =
= 2/3
18 is 20% of
90 Change the percentage into a decimal by dividing it over 100:
Divide 18 by 0.2:
First, add 84 to both sides, to isolate the exponential function.
Then, take the logarithm of both sides:
(2x+3)*log 5 = log 84
Solving for 2x+3, we get log 84 - log 5, and so
2x = -3 + log 84 - log 5. Dividing both sides by -3, we obtain the final answer:
-3 + log 84 - log 5
x = -----------------------------
2
<h3>Given</h3>
... f(x) = 4^x
<h3>Find</h3>
... x for f(x) = 64
<h3>Solution</h3>
Rewrite 64 as a power of 4, then equate exponents.
... 64 = 4^x
... 4^3 = 4^x
... 3 = x
The store sells 64 caps in month 3.