Test the claim below about the mean of the differences for a population of paired data at the level of significance \( \alpha \). Assume the samples are random and dependent, and the populations are normally distributed. Claim: \( \mu_{d} \geq 0 ; \alpha=0.01 \). Sample statistics: \( \bar{d}=-2.3, s_{d}=1.5, n=20 \)

Instructions: Read each sentence and identify the tense used. 1. She is reading a book right now. 2. They went to the movies last night. 3. I will be traveling to Paris next summer. 4. He plays soccer every Saturday. 5. We were watching a documentary when the phone rang. 6. The children are playing in the park. 7. I will be studying for my exams tomorrow evening. 8. I will call you later this evening. 9. They are studying for their exams right now. 10. He was cooking dinner when I arrived. 11. We visited our grandparents last weekend. 12. She will be working late tomorrow.

El conjunto solución de la inecuación \( -x(x-2)>12 x+21 \) es:

(R) Rosario quiere cercar su jardín cuadrado para evitar ¿Cuántros metros de malla debe comprar para hacer el cerramiento?

Calcular la velocidad con que se propaga una onda longitudinal cu frecuencia es de 140 ciclos/seg. Y su longitud de onda es de 15 m .

\( A = \square \quad \cup \square \)