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2 years ago

How to solve 25= 4+ 7x

Mathematics

1 answer:

Gnom [1K]2 years ago

3 0

Answer: x =3

Step-by-step explanation:

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Solve x and y 3x-4y=18,9x-2y=12

Rudiy27

Answer:

3x-4y=18

1xy=18

xy=18 ans

4 0

3 years ago

Read 2 more answers

The sum of two numbers is 9.9, and the sum of the squares of the numbers is 53.21. What are the numbers?

Snezhnost [94]

Answer:

There are two possibilities:

$x_{1} = 3.5$ and $y_{1} = 6.4$

$x_{2} = 6.4$ and $y_{2} = 3.5$

Step-by-step explanation:

Mathematically speaking, the statement is equivalent to this 2-variable non-linear system:

$x + y = 9.9$

$x^{2} + y^{2} = 53.21$

First, $x$ is cleared in the first equation:

$x = 9.9 - y$

Now, the variable is substituted in the second one:

$(9.9-y)^{2} + y^{2} = 53.21$

And some algebra is done in order to simplify the expression:

$98.01-19.8\cdot y +2\cdot y^{2} = 53.21$

$2\cdot y^{2} -19.8\cdot y +44.8 = 0$

Roots are found by means of the General Equation for Second-Order Polynomials:

$y_{1} \approx \frac{32}{5}$ and $y_{2} \approx \frac{7}{2}$

There are two different values for $x$ :

$y = y_{1}$

$x_{1} = 9.9-6.4$

$x_{1} = 3.5$

$y = y_{2}$

$x_{2} = 9.9 - 3.5$

$x_{2} = 6.4$

There are two possibilities:

$x_{1} = 3.5$ and $y_{1} = 6.4$

$x_{2} = 6.4$ and $y_{2} = 3.5$

5 0

3 years ago

It is 10:30pm and my brain is not cooperating with me.

r-ruslan [8.4K]

Answer:

$v = 180 {cm}^{3}$

Step-by-step explanation:

V= lwh or l *w*h

Length: 15

Width: 3

Height:4

V=15*3*4

V=180

5 0

2 years ago

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Speed can be found using the formula s = d/t (d = distance, t = time). True or false

Galina-37 [17]

False, it would be d*t (distance*time)

8 0

3 years ago

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PLEASE HELP ITS A TEST Solve for x : - 1/2 (x + 3) - 10 = -6.5

Ksju [112]

Answer hey:

Step-by-step explanation:

4 0

3 years ago