2 계급의 개수가 5 개인 도수분포표의 첫 번째 계급의 계급값이 150 이고 마지막 계급의 계급값은 230 일 때, 다음 물음에 답하여라. (1) 이 도수분포표의 계급의 크기를 구하여라. (2) 계급값이 작은 쪽에서 세 번째 계급에 속하는 변량이 \( x \) 일 때, \( x \) 의 값의 범위를 구하여라.

"engaged" is referring to? Put your cellphone away. Stop texting. Stop using the camera as a mirror. Stop looking at Instagram. They're the familiar commands of teachers and educators in the age of the smartphone. Most schools have put in place policies banning or regulating phone usage during school hours, and teachers now routinely find themselves confiscating devices or writing up students for being on their phones. Allison Silvestri, the former principal of San Lorenzo High School east of San Francisco, C implemented the tool three years ago. The results "were tremendous," she said. The

LUESTION 9 The derivative of \( y=4 x^{2}-x+1 \) is \( \begin{array}{ll}\text { A. } 8 x & \text { B. } 7 x \\ \text { C. } 2 x-1, & \text { D. } 8 x-1\end{array} \)

Grafique las siguientes ecuaciones polares \( r^{2} \cos \theta \sin \theta=4 \)

A roll of wire with a length of 55 cm was used to make the framework for a cube. The volume of the cube is a perfect cube. If the wire is used to the maximum, calculate the length, in cm, remainder of the wire.

1. गुणनखंड क (i) \( a^{2}- \) (iv) \( 9 a^{2} \) (vii) 25 (a 2. गणनखंड की