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irina1246 [14]
3 years ago
15

Randy has a lot of homework tonight. He needs to work for 45 minutes on social studies, 40 minutes on science, and 1 hour and 15

minutes on math. It will also take him 10 minutes to get ready for bed. If he wants to be in bed at 10:00, what time does he need to start his homework?
Mathematics
2 answers:
mel-nik [20]3 years ago
6 0
He needs to start his homework at 7:10
Bess [88]3 years ago
3 0

Answer:

You add up 45 and 15 to get one hour, then add the remaining 40 and 10. Then the hour. After it is all added up you will have 2hrs and 50. He would need to starts  at 7:10

Step-by-step explanation:


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En una hoja de papel cuyo perímetro es de 96 centímetros, se quiere imprimir un volante de manera que el área impresa sea un rec
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Answer:

El perímetro de la región impresa es 72 cm y su área es 288 cm².  

Step-by-step explanation:

1. Tenemos el perímetro de la hoja de papel:

P₁ = 96 cm = 2l₁ + 2a₁  (1)  

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El perímetro del rectángulo interno es:

P_{2} = 2l_{2} + 2a_{2}    (4)

Introduciendo la ecuación (2) y (3) en (4):

P_{2} = 2l_{2} + 2a_{2} = 2(l_{1} - 5 cm) + 2(a_{1} - 7 cm) = 2l_{1} + 2a_{1} - 10 cm - 14 cm = 96 cm - 24 cm = 72 cm  

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2. Ahora para encontrar el área rectángulo interno debemos encontrar el largo y ancho del mismo, sabiendo que:

l_{2} = 2a_{2}     (5)

Introduciendo (5) en (4):

P_{2} = 2l_{2} + 2a_{2} = 2*2a_{2} + 2a_{2} = 6a_{2}

a_{2} = \frac{P_{2}}{6} = \frac{72 cm}{6} = 12 cm

l_{2} = 2a_{2} = 2*12 cm = 24 cm

Entonces el área es:

A_{2} = l_{2}*a_{2} = 12 cm*24 cm = 288 cm^{2}

Por lo tanto el área del rectágulo interno (región impresa) es 288 cm².      

Espero que te sea de utilidad!  

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