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Alik [6]
3 years ago
13

Find the solution of the system of equations. –7x – 3y = –20 3х + 6= -15

Mathematics
1 answer:
Nutka1998 [239]3 years ago
7 0

Answer:

(-7,23)

Step-by-step explanation:

You can use the app photo math

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Dubnium-262 has a half-life of 34 s. How long will it take for 500.0 grams to
dmitriy555 [2]

Answer:

the time taken for the radioactive element to decay to 1 g is 304.8 s.

Step-by-step explanation:

Given;

half-life of the given Dubnium = 34 s

initial mass of the given Dubnium, m₀ = 500 grams

final mass of the element, mf = 1 g

The time taken for the radioactive element to decay to its final mass is calculated as follows;

1 = 500 (0.5)^{\frac{t}{34}} \\\\\frac{1}{500} =  (0.5)^{\frac{t}{34}}\\\\log(\frac{1}{500}) = log [(0.5)^{\frac{t}{34}}]\\\\log(\frac{1}{500})  = \frac{t}{34} log(0.5)\\\\-2.699 = \frac{t}{34} (-0.301)\\\\t = \frac{2.699 \times 34}{0.301} \\\\t = 304.8 \ s

Therefore, the time taken for the radioactive element to decay to 1 g is 304.8 s.

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2 years ago
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Nikitich [7]
45 cookies will serve 15 students.

You would multiply 15 by 2 that would give you 30, therefore you multiply 45 by 2 which will be 90.

90 cookies will serve 30 students
6 0
3 years ago
If Charlie liked dogs, and Macy's hat was green, how fast was the car, that the dog's dad was driving?
Likurg_2 [28]

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Step-by-step explanation:

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In preparation for the Maths festival you are asked to work out how much water the drinks area will need for the event. The aren
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Total liters of water needed = number of attendee x water                            consumption/attendee wherenumber of attendee = 7000 attendeewater consumption/attendee = 0.5litre of water/attendeetotal = 7000 x 0.5 litre        = 3500 litrescomputing the water requirement per 200 litre containerwater requirement in the event = 3500 litres/200 litre /container                                                  = 17.5 containersThe water requirement in the event at the arena of 7000 attendees is 17.5 containers. 
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3 years ago
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