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3 years ago

10

Solve algebraic equation -4x + 7 = 15

2 answers:

mash [69]3 years ago

6 0

-4x+7=15
-7 -7
-4x =8
-4x/-4= 8/-4
x=-2

x=-2

yan [13]3 years ago

3 0

Answer:

x=-2

Step-by-step explanation

-4(-2)+ 7

8+7=5

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We know that $y = x^2$ is a parabola, concave up, with vertex in the origin $(0,0)$

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Here's the examples:

The horizontal line $y = 4$ intercepts the parabola twice: the system $y = x^2,\ y = 4$ is solved by $x^2=4 \implies x = \pm 2$
The horizontal line $y=0$ intercepts the parabola only once: the system is $y=x^2,\ y=0$ which yields $x^2=0\implies x=0$ which is a repeated solution
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3 years ago

The lengths of pregnancies in a small rural village are normally distributed with a mean of 265 days and a standard deviation of

MakcuM [25]

Answer:

the middle 50% of most lengths of pregnancies ranges between 255.62 days and 274.38 days

Step-by-step explanation:

Given that :

Mean = 265

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The formula for calculating the z score is $z = \dfrac{x -\mu}{\sigma}$

x = μ + σz

At middle of 50% i.e 0.50

The critical value for $z_{\alpha/2} = z_{0.50/2}$

From standard normal table

$z_{0.25}=$ + 0.67 or -0.67

So; when z = -0.67

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when z = +0.67

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x = 265 + 14 (0.67)

x = 265 + 9.38

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