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blsea [12.9K]
3 years ago
12

Solve this system of equations using substitution:

Mathematics
1 answer:
irina [24]3 years ago
3 0
The substitution method means you replace the variable in one equation with the other equation, so your new equation is x+4x-8=10. Add 10 to both sides to get 5x=18. Divide both sides by 5 to get x=3.6. This is a weird equation, but then to get y, work backwords. 3.6 times 2=7.2. 7.2-4=3.2 y=3.2. Finally to finish checking solve the equation as normal. 3.6+6.4=10. I hope this helped! Please give brainliest!
Your final answer is x=3.6 y=3.2
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A con is tossed n times. How many difference sequences of head and tails can you get?
ryzh [129]

Answer:

2^n

Step-by-step explanation:

So whenever you flip a coin, you can see it as 2 nodes branching off of each existing node. so for example when you flip a coin once you're going to have 2 sequences initially H and T, now when you flip a coin again for each of those 2 sequences 2 are going to branch off of that, making the total sequences 4, and the next flip 2 sequences are going to branch off each of the 4 sequences and so on. this can generally be described as: 2^n

I attached an image describing this a bit better but the bottom line is that for each 'end node'/sequence you're going to have 2 branch off of it, thus for each coin flip the number of sequences multiplies by 2

5 0
2 years ago
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Solve i don't understand it with letters
fredd [130]

Answer:

Isolate the variable by dividing each side by factors that don't contain the variable.

y = \frac{f}{kr}

8 0
3 years ago
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What is the area of a rectangle that is 3.1 cm wide and 4.4 cm long? Enter the full-precision answer first to see the correspond
Brrunno [24]

Answer:  Without rounding : 13.64 (square cm)

Rounded answer : 13.6(square cm)

Step-by-step explanation:

We know that the area of a rectangle is given by :-

A=l\times w, where l is the length and w is the width of the rectangle.

Given : The dimensions of a rectangle are 3.1 cm wide and 4.4 cm long.

Then, the area of rectangle will be:-

A=4.4\times 3.1=\dfrac{44}{10}\times\dfrac{31}{10}\\\\=\dfrac{1364}{100}=13.64\text{ cm}^2\approx13.6\ cm^2  \text{Rounded to the nearest tenth}

Therefore, the area of rectangle =13.6\text{ cm}^2

3 0
4 years ago
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Question 8 - Find the mean
andre [41]

Answer:

You can hack it double click and press inspect for answers

Step-by-step explanation:

7 0
3 years ago
Can someone answer these questions & explain how to get the answer will mark brainlest!
viva [34]

Answer:

25) 3 = 5 + secΘ where we have 2 possible values of Θ (2π/3 or 4π/3)

<em>3 = 5 + sec (2π/3)</em>

<em>3 = 5 + sec (120 degrees)</em>

<em>3 = 5 + (-2)</em>

<em>3 = 3</em>

theta =  4π/3

<em>3 = 5 + sec (240 degrees)</em>

<em>3 = 5 + (-2)</em>

<em>3 = 3</em>

Therefore, the equation is true for both 2π/3 and 4π/3

27) -2 SinΘ = -1                {π/6 , 5π/6}

<em>-2 * sin(π/6) = -1 </em>

<em>sin(π/6) = 1/2</em>

1/2 = 1/2

LHS = RHS

theta  = 5π/6

<em>-2 sin(5π/6) = -1 </em>

<em>sin(5π/6) = 1/2 </em>

1/2 = 1/2

LHS = RHS

<em></em>

Kindly Mark Brainly

3 0
3 years ago
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