Daily Math · 2026-07-01

Question 1

The solution of $3x + 5 = 14$ is:

Accepted Answer

$3x = 14 - 5 = 9 \Rightarrow x = 3$.

Answer

$2$

Answer

$3$

Answer

$4$

Answer

$\dfrac{14}{3}$

Question 2

The maximal domain of $f(x) = \sqrt{x^2 - 4}$ is:

Accepted Answer

$x^2 - 4 \ge 0 \Leftrightarrow x \le -2$ or $x \ge 2$. Domain: $(-\infty, -2] \cup [2, +\infty)$.

Answer

$[-2, 2]$

Answer

$\mathbb{R}$

Answer

$(-\infty, -2] \cup [2, +\infty)$

Answer

$(2, +\infty)$

Question 3

A bank advertises $12\%$ annual rate compounded monthly. The effective annual rate is closest to:

Accepted Answer

$\!\left(1 + \dfrac{0.12}{12}\right)^{12} - 1 = 1.01^{12} - 1 \approx 1.1268 - 1 = 0.1268 \approx 12.68\%$.

Answer

$12\%$

Answer

$12.68\%$

Answer

$13.5\%$

Answer

$14.4\%$

Problems & worked solutions