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pashok25 [27]
2 years ago
15

I need to know the solution to this

Mathematics
1 answer:
Alex73 [517]2 years ago
8 0
There are two ways to do this but the way I prefer is to make one of the equations in terms of one variable and then 'plug this in' to the second equation. I will demonstrate

Look at equation 1, -2x+y=10 this can quite easily be manipulated to show y=10+2x.

Then because there is a y in the second equation (and both equations are simultaneous) we can 'plug in' our new equation where y is in the second one 4x-y=-14 \Rightarrow 4x-(10+2x)=-14 which can then be solved for x since there is only one variable 4x-10-2x=-14 \Rightarrow 2x=-4 \Rightarrow x=-2 and then with our x solution we can work out our y solution by using the equation we manipulated y=10+2x = 10+(2 \times -2) = 10-4=6.

So the solution to these equations is x=-2 when y=6
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The speeds of cars on a given i street we are normally distributed with a mean of 72 miles per hour and a standard deviation of
Ostrovityanka [42]

Answer: 72.78% of the drivers are traveling between 70 and 80 miles per hour based on this distribution.

Step-by-step explanation:

Let X be a random variable that represents the speed of the drivers.

Given: population mean : M = 72 miles ,

Standard deviation: s= 3.2 miles

The probability that the drivers are traveling between 70 and 80 miles per hour based on this distribution:

P(70\leq X\leq 80)=P(\frac{70-72}{3.2}\leq \frac{X-M}{s}\leq\frac{80-72}{3.2})\\\\= P(-0.625\leq Z\leq 2.5)\ \ \ \ \ [Z=\frac{X-M}{s}]\\\\=P(Z\leq2.5)-P(Z\leq -0.625)\\\\\\ =0.9938-0.2660\ \ \ [\text{Using p-value calculator}]\\\\=0.7278

Hence, 72.78% of the drivers are traveling between 70 and 80 miles per hour based on this distribution.

3 0
3 years ago
Yeah thanks m8 for this
nikitadnepr [17]

Step-by-step explanation:

the process is shown in the picture.

4 0
3 years ago
3. The sides of one triangle are 6, 8, and 10. The sides of another triangle are 10, 24, and
irakobra [83]

Answer: i think its either 3:5 or 1:3 or there just not similar

Step-by-step explanation:

3 0
3 years ago
(−7c+8d)0.6<br> write this as an equivalent equation
KengaRu [80]

-4.2c+4.8d is the answer to this equation.

8 0
2 years ago
Read 2 more answers
PLEASE SOLVE PLEASE!!​
Oksanka [162]

Answer:

which one do you need?

Step-by-step explanation:

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