ABCD is a rectangle in which diagonal AC bisects \( \angle \mathrm{A} \) as well as \( \angle \mathrm{C} \). Show that: (i) ABCD is a square (ii) diagonal BD bisects \( \angle \mathrm{B} \) as well as \( \angle \mathrm{D} \).

Which one of the following hypotheses is/are valid? 1. \( H_{0}: \mu \leq 100 ; H_{1}: \mu \geq 100 \) 2. \( H_{0}: \mu=120 ; H_{1}: \mu \neq 120 \) 3. \( H_{0}: \mu \neq 130 ; H_{1}: \mu=130 \) 4. \( H_{0}: \bar{X} \leq 210 ; H_{1}: \bar{X}>210 \) 5. \( H_{0}: p \neq 0.42 ; H_{1}: p=0.42 \)

Add. \( \quad 15 \sqrt{-75}+9 \sqrt{-48} \)

1. Frankie solved the equation below. Describe Frankie's mistake and record the correct olution. \[ \begin{array}{r}2.3 x-3.9+1.2 x-4.6=2 \\ 3.5 x-8.5=2 \\ 3.5 x=10.5 \\ x=7\end{array} \] ummarize today's lesson:

White a sentence to evplain how lacob could use estimate to tell that his answer is incoled

Tentukanlah himpunan penyelesaian dari pertidaksamaan berikut \[ \begin{array}{l}x+3 \\ x^{2}-4\end{array} \]