Daily Math · 2026-05-21

Question 1

The solution set of $2^{x} < 8$ is:

Accepted Answer

$(-\infty, 3)$

Answer

$(-\infty, 3]$

Answer

$(3, +\infty)$

Answer

$[3, +\infty)$

Question 2

For $A = \begin{pmatrix} 1 & 1 \ 0 & 1 \end{pmatrix}$, the matrix $A^2$ equals:

Accepted Answer

$\begin{pmatrix} 1 & 2 \ 0 & 1 \end{pmatrix}$

Answer

$\begin{pmatrix} 1 & 1 \ 0 & 1 \end{pmatrix}$

Answer

$\begin{pmatrix} 1 & 0 \ 0 & 1 \end{pmatrix}$

Answer

$\begin{pmatrix} 2 & 2 \ 0 & 2 \end{pmatrix}$

Question 3

Three numbers in arithmetic progression have sum $15$ and the sum of their squares is $83$. The largest of them is:

Accepted Answer

$7$

Answer

$5$

Answer

$6$

Answer

$8$