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4 years ago

Solve the system given: 3x - y = 7 2x + y = 3

Mathematics

2 answers:

ruslelena [56]4 years ago

7 0

Answer: x=2 and y=-1

Step-by-step explanation:

Ivenika [448]4 years ago

5 0

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Data accumulated by the National Climatic Data Center shows that the average wind speed in miles per hour for St. Louis,Missouri

Marat540 [252]

Answer:

The value is $\sigma = 8.5$

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 9.7$

The proportion is $P(X >x) = 0.2245$

The value considered is $x = 11.6$

Generally given that the speed measurement is normally distributed we have that

$P(X > 11.6) = P(\frac{ X - \mu }{ \sigma } > \frac{11.6 - 9.7}{ \sigma } ) = 0.2245$

Generally

$\frac{X - \mu}{ \sigma } = Z(The \ z -score \ of \ X )$

$P(X > 11.6) = P(Z> \frac{11.6 - 9.7}{ \sigma } ) = 0.2245$

Hence

$\frac{ 11.6 - 9.7}{ \sigma} = 0.2245$

$\sigma = 8.5$

6 0

3 years ago

Pls help me no explain need ❤️❤️❤️

RoseWind [281]

Answer:

$\displaystyle m=2$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Reading a Cartesian plane
Coordinates (x, y)
Slope Formula: $\displaystyle m=\frac{y_2-y_1}{x_2-x_1}$

Step-by-step explanation:

Step 1: Define

Find points from graph.

Point (-5, 0)

Point (-9, -8)

Step 2: Find slope m

Simply plug in the 2 coordinates into the slope formula to find slope m

Substitute in points [Slope Formula]: $\displaystyle m=\frac{-8-0}{-9+5}$
[Fraction] Subtract/Add: $\displaystyle m=\frac{-8}{-4}$
[Fraction] Divide: $\displaystyle m=2$

3 0

3 years ago

The smaller triangle is a dilation of the larger triangle with a center of dilation at (2,−1) .

andrew-mc [135]

Answer:

Option B. 1/2

Step-by-step explanation:

The smaller triangle is a dilation of the larger triangle with the center of dilation at (2, -1).

we have to calculate the scale factor of the dilation.

One point of the large triangle is (-4, -1). After dilation it has become (-1, -1) of the smaller one.

If we consider the x coordinates of the point x = -4 has reduced down to -1 therefore scale factor = side of small triangle/side of the large triangle = (2 + 1)/(2 + 4) = 3/6 = 1/2

Therefore Option B. 1/2 is the answer.

3 0

3 years ago

Read 2 more answers

Answer quickly please! Find the perimeter of the figure to the nearest hundredth.

Ronch [10]

10+8+6=24

π x 12/2
6 π
24+6 π= 42.84955592

Answer= 42.849cm

5 0

3 years ago

Describe how you could use algebraic operations to solve the equation 1 = -3x + 4

Anna11 [10]

Answer:

x=1

Step-by-step explanation:

3x=4-1

3x=3

x=1

3 0

3 years ago