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ikadub [295]
3 years ago
11

I have no idea how to do this ha​

Mathematics
2 answers:
liraira [26]3 years ago
8 0

Answer:

X=30

Step-by-step explanation:

2x+50+5x-80=180

7x-30=180

7x=210

×=30

TEA [102]3 years ago
7 0

Answer:

30

Step-by-step explanation:

If they are parallel then the 2 labelled angles sum to 180.

2x+50+5x-80=180

7x-30=180

7x=210

x=30

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What is the discriminant of the quadratic equation 4x^2-7x-6=04x 2 −7x−6=0?
Wittaler [7]

Answer:

  145

Step-by-step explanation:

The discriminant of quadratic ...

  ax^2 +bx +c = 0

is ...

  d = b^2 -4ac

For your quadratic, you have a=4, b=-7, c=-6, so the discriminant is ...

  d = (-7)^2 -4(4)(-6) = 49 +96 = 145

The discriminant is 145.

7 0
4 years ago
System A
Sonbull [250]

1.  System B from System A by replacing one equation with itself where the same quantity is added to both sides

2. Yes, both system A and system B are equivalent and therefore has the same solution

<h3>How to prove the statements</h3>

System A

x − 4y= 1

5x + 6y= −5

System B

x = 1+4y

5x + 6y= −5

1. System B can be gotten from system A by

from the first equation of A

x − 4y= 1

Make 'x' subject of formula

x = 1 + 4y

This makes it equal to tat of system B

Thus, replacing one equation with itself where the same quantity is added to both sides

2. System A

x = 1 + 4y

5x + 6y= −5

System B

x = 1 + 4y

5x + 6y= −5

From the above equations, we can see that both system A and system B are equivalent and therefore has the same solution.

Learn more about linear equations here:

brainly.com/question/4074386

#SPJ1

4 0
2 years ago
Solve the system
geniusboy [140]
The answer is A. You can get that in by plugging in and checking or by substitution. In order to use substitution here, you would plug in 3x + 3 into y in the first equation. You would then distribute the 2 and solve for x, which would give you 0. Then you could plug that into either equation to find that y = 3. 
4 0
3 years ago
What is (-3)-(-6)×(-9)?
Zepler [3.9K]
(-3)-(-6)×(-9)

Simplify your equation to make it look neater.

(-3)+(6)×(-9)

Combine like terms.

(-3+6)×(-9)

Simplify.

(3)×(-9)

Simplify. Remember, a negative times a positive is ALWAYS a negative. 

-27

~Hope I helped!~




3 0
3 years ago
In the theory of learning, the rate at which a subject is memorized is assumed to be proportional to the amount that is left to
babymother [125]

Answer:

dA/dt = k1(M-A) - k2(A)

Step-by-step explanation:

If M denote the total amount of the subject and A is the amount memorized, the amount that is left to be memorized is (M-A)

Then, we can write the sentence "the rate at which a subject is memorized is assumed to be proportional to the amount that is left to be memorized" as:

Rate Memorized = k1(M-A)

Where k1 is the constant of proportionality for the rate at which material is memorized.

At the same way, we can write the sentence: "the rate at which material is forgotten is proportional to the amount memorized" as:

Rate forgotten = k2(A)

Where k2 is the constant of proportionality for the rate at which material is forgotten.

Finally, the differential equation for the amount A(t) is equal to:

dA/dt = Rate Memorized - Rate Forgotten

dA/dt = k1(M-A)  - k2(A)

7 0
4 years ago
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