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lisabon 2012 [21]
3 years ago
9

Solve the system using elimination: 5x+4y=12 3x-3y=18

Mathematics
1 answer:
Stels [109]3 years ago
8 0
I hope this helps you

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A region with a 5-mile radius has a population density of about 3100 people per square mile. Find the number of people who live
Gwar [14]

Answer:

243,000 people

Step-by-step explanation:

First, what we need to do is to calculate the area of the region using the 5-mile radius

Mathematically, we can calculate this as the area of a circle

Area = pi * r^2

Our r here is 5 miles

Area = pi * 5^2 = pi * 25 = 78.54 square miles

Now to get the population, we know that per square mile we have 3,100.

Hence per 78.54 square mile, we have 78.54 * 3100 = 243,273 people

To the nearest thousand, 243,000

4 0
3 years ago
The first number is 14 less than the second number. When she adds them, she gets 40.
Alenkinab [10]

Answer:

second number is 17, first number is 3

Step-by-step explanation:

5 0
3 years ago
A toy rocket is launched straight up from the top of a building. The function that models the height as a function of time is h(
kicyunya [14]

Answer: 50 ft

Step-by-step explanation:

The correct function is h(t)=-16t^2+200t+50.

Hi, to answer this question we simply have to replace t =0 in the function given:

h(t)=-16t^2+200t+50.

h (0) = -16t^2+200t+50.

h(0) = 50

When the time is 0, the rocket is at the top of the building.

The rocket was launched from a 50 ft height.

Feel free to ask for more if needed or if you did not understand something.  

4 0
3 years ago
Question 1 :<br><br> what means to make a fraction as simple as possible? we also call it reducing.
Diano4ka-milaya [45]
This means making the fraction reduced to its lowest term
example= 
make the fraction 18xz/4z simpler
the z cancels each other making it remaining 18x/4
2 can go in x as in 18
=9x/2
so the simpler form of the fraction 18xz/4z
=9x/2
4 0
3 years ago
Solve what is 1/2 x 15
Andreas93 [3]

Answer:

7.5

Step-by-step explanation:

it's basically just 15 divided by 2

8 0
3 years ago
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