Exponential Equation | MATHalino reviewer about Exponential Equation

Problem
A germ population has a growth curve $Ae^{0.4t}$. At what value of $t$ does its original value doubled?

A. t = 7.13	C. t = 1.73
B. t = 1.37	D. t = 3.71

Problem
Solve for x, y, and z from the following simultaneous equations.

$x^2 - yz = 3$ ← Equation (1)

$y^2 - xz = 4$ ← Equation (2)

$z^2 - xy = 5$ ← Equation (3)

Problem 7
Determine the value of $x$ from $\sqrt[4]{3^{x^2}\sqrt{3^{x - 1}}} = \sqrt[8]{9^{x + 1}}$

Solve for the value of x from each of the following equations:

Solve for $x$ from the following equations:

$\left( \dfrac{x^2 - 15}{x} \right)^2 - 16\left( \dfrac{15 - x^2}{x} \right) + 28 = 0$
$\dfrac{x}{\sqrt{x} + \sqrt{9 - x}} + \dfrac{x}{\sqrt{x} - \sqrt{9 - x}} = \dfrac{24}{\sqrt{x}}$

Problem
Solve for x, y, and z from the following simultaneous equations.

$z^x \, z^y = 100\,000$ ← equation (1)

$(z^x)^y = 100\,000$ ← equation (2)

$\dfrac{z^x}{z^y} = 10$ ← equation (3)