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3 years ago

I NEED HELP AND QUICK.

Mathematics

1 answer:

jeka943 years ago

7 0

Answer:

D (30)

Step-by-step explanation:

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The distribution of passenger vehicle speeds traveling on a certain freeway in California is nearly normal with a mean of 73.7 m

umka2103 [35]

Answer:

a) 0.2347, 0.0007

b) 1.30

c) 0.63

Step-by-step explanation:

Given –

Mean = 73.4

Sigma = 4.7

Probability that the speed is greater than 70 is

P (X>70) = P (z> (70-73.4)/4.7) = P (z>-0.72) = 0.7653

a) The probability that a car is not speeding = 1 - 0.7653 = 0.2347

The probability that all 5 cars are not speeding = (0.2347)5 = 0.0007

b) E (X) = 1/p = 1/0.7653 = 1.30

c) Standard deviation = Sqrt (1-p/p) = (1-0.7653)/0.7653 = 0.63

5 0

2 years ago

NEED HELP NOW

Semmy [17]

The area of rectangular garden is $8 x^{2}+4 x-24$

<h3>Solution:</h3>

Given that a rectangular garden has width = 4x - 6

Length of rectangular garden = 2x + 4

To find: area of rectangular garden

The area of rectangle is given as:

$\text {area of rectangle }=\text { length } \times \text { width }$

Substituting the values in given formula,

$\begin{array}{l}{\text { area of rectangle }=(2x+4) \times(4x-6)} \\\\ {=8 x^{2}-12 x+16 x-24} \\\\ {=8 x^{2}+4 x-24}\end{array}$

Thus the area of rectangular garden is $8 x^{2}+4 x-24$

3 0

3 years ago

Jerry solved the system of equations. x minus 3 y = 1. 7 x + 2 y = 7. As the first step, he decided to solve for y in the second

Reika [66]

Answer:

A. The variable x in the first equation has a coefficient of one so there will be fewer steps to the solution.

Step-by-step explanation:

Given

$Equation\ 1: x - 3y = 1$

$Equation\ 2: 7x + 2y = 7$

Required

Efficient way of solving the equations

The efficient way of solving this problem is by solving for x in the first equation because it has a coefficient of 1;

The evidence is shown as follows;

Make x the subject of formula in equation 1

$x = 1 + 3y$

Substitute 1 + 3y for x in equation 2

$7x + 2y = 7$

$7(1 + 3y) + 2y = 7$

Open bracket

$7 + 21y + 2y = 7$

$7 + 23y =7$

Make y the subject of formula

$23y = 7 - 7$

$23y = 0$

Divide both sides by 23

$\frac{23y}{23} = \frac{0}{23}$

$y = 0$

Recall that x = 1 + 3y

Substitute 0 for y in the above expression

$x = 1 + 3(0)$

$x = 1 + 0$

$x = 1$

Solving for y in the second equation will take more steps

6 0

3 years ago

Find the value of y if M is the midpoint of LN. 9y - 4 6y + 5 N

Setler79 [48]

Answer:

If M is the midpoint, then LM = MN.

3x - 2= 2x +1.

x = 3.

So LM = 3x - 2 = 9 -2 = 7.

LM = 7.

4 0

3 years ago

2. The product of an even number and an odd number is an even number.

ASHA 777 [7]

Answer:

Step-by-step explanation:

ok thanks

4 0

3 years ago

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