3 years ago

Pl help it’s For a grade I will give you Brainly

Mathematics

1 answer:

Nookie1986 [14]3 years ago

3 0

Y=-4(x+2)^2+8
-4(x^2+2x+4)+8
-4x^2-8x-8

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Write two solutions for the following equation 2x+3y=24.

SVETLANKA909090 [29]

Answer: (12, 0) and (0, 8)

Step-by-step explanation:

This equation is in standard form. We can sub in a number for x to solve for y and vice versa.

Let's sub in 0 for x.

$2x+3y=24\\2(0)+3y=24\\3y=24\\\frac{3y}{3} =\frac{24}{3} \\y=8$

When x is 0 y is 8 giving us the coordinate (0, 8).

Now lets sub in 0 for y

$2x+3(0)=24\\2x=24\\\frac{2x}{2} =\frac{24}{2} \\x=12$

When y is 0 x is 12 giving us the coordinate (12, 0)

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3 years ago

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A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with σ = 31.62

AysviL [449]

Answer:

A sample size of at least 737 specimens is required.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the width M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this problem, we have that:

$M = 3, \sigma = 31.62$

So:

$M = z*\frac{\sigma}{\sqrt{n}}$

$3 = 2.575*\frac{31.62}{\sqrt{n}}$

$3\sqrt{n} = 81.4215$

$\sqrt{n} = 27.1405$

$n = 736.60$

A sample size of at least 737 specimens is required.

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4 years ago

Geoff charges $27 for 3 hours of swimming lessons. Anne charges $31 for 4 hours. How much more does Geoff charge per hour than A

Yakvenalex [24]

Divide 27 and 3. then divide 31 and 4. you get 9 and 7.75. subtract those. you get 1.25

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3 years ago

Unit 4 Lesson 13 exit ticket (please help me im getting stressed with this)

Illusion [34]

Answer:

1. is A

and

2. is c

Step-by-step explanation:

hope this helps

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3 years ago

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Is 4x=2(2x-2) A no solution or one solution or infinite solution

maxonik [38]

Answer:

no solution

Step-by-step explanation:

2 x 2x, 2 x -2, you now have 4x=4x-4, subtract 4x and 4x and you are left with -4

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3 years ago