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Nadya [2.5K]
3 years ago
14

Who ever helps me with all theses you will get 50 points​

Mathematics
2 answers:
Vera_Pavlovna [14]3 years ago
5 0

Answer:

All is correct what do you want us to do again

Step-by-step explanation:

Law Incorporation [45]3 years ago
3 0

Answer:

There already correct!

Step-by-step explanation:

And it doesn't give 50points it only gave 20points!!!!

I would answer it but you cant even see the picture of the questions......

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Question 7 of 10
Afina-wow [57]

Answer:

B. x = 5/2

Step-by-step explanation:

quadratic formula is:

(x=-b ± \sqrt{b^2-4ac})/2a

when ax^2 + bx + c = 0

in this equation, a = 1, b = -5, c = 25/4

plug those into the equation and simplify to get x=5/2

(because b^2-4ac in this case is equal to 0, there is only one answer)

3 0
2 years ago
Solve the following system of equations by the substitution method. 5x = y + 6 2x - 3y = 4 What is the value of the y-coordinate
horsena [70]
Why do I have to put 20 characters here?

5 0
3 years ago
Read 2 more answers
A train covers a distance of 456 km in 4hours 45 minutes. Calculate the speed of the train .
Alexus [3.1K]
By definition we have to:
 v = d / t
 Where,
 v: speed
 d: distance
 t: time
 The time in hours is given by:
 t = 4 + (45/60)
 t = 4.75 hours
 Substituting values we have: 
 v = 456 / 4.75
 v = 96 km / h
 Answer:
 the speed of the train is:
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5 0
3 years ago
Find K by evaluating Limit
Lubov Fominskaja [6]

Answer:

4

Step-by-step explanation:

\lim_{x \to \infty}\frac{1-cos4x}{1-cos2x}= \lim_{x \to 0} \frac{(1-cos4x)'}{(1-cos2x)'}= \lim_{x \to 0}\frac{4sin4x}{2sin2x}= \lim_{x \to 0}\frac{2*2sin2xcos2x}{sin2x}\\ = \lim_{x \to 0}4cos2x\\ =4

{L'Hospital's rule}

<em>I hope this helps you</em>

<em>:)</em>

6 0
2 years ago
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