What are the x-intercepts for the quadratics below: (show all work HHHHHHHHEEEEEEELLLLLLLLPPP

1. x2 - 7x - 18


2. 2b2 + 17b + 21

Answer:

the first one is 6 and the second one is -2

Step-by-step explanation:

bc/2 ---> (3)(4)/2 = 12/2 = 6

4a + 6 = 4(-2) + 6 = -8 + 6 = -2

Answer:

lol

Step-by-step explanation:

im laughing in class

Answer:

[tex]n1 = 9[/tex] and [tex]n2 = 9[/tex]

[tex]df1 = 8[/tex] and [tex]df2 = 8[/tex]

[tex]df = 16[/tex]

Step-by-step explanation:

Given

The above data

Solving (a): n1 and n2

This is the number of rows in each category

For sample A

[tex]n1 = 9[/tex]

For sample B

[tex]n2 = 9[/tex]

Solving (b): df1 and df2

This is calculated as:

[tex]df = n - 1[/tex]

For n1:

[tex]df1 = n1 - 1[/tex]

[tex]df1 = 9 - 1[/tex]

[tex]df1 = 8[/tex]

For n2:

[tex]df2 = n2- 1[/tex]

[tex]df2 = 9- 1[/tex]

[tex]df2 = 8[/tex]

Solving (c): Total df

Since there 2 categories of data, the total degrees of freedom is:

[tex]df = n1 + n2 - 2[/tex]

[tex]df = 9 + 9 - 2[/tex]

[tex]df = 16[/tex]

Answer:

The value of the test statistic is -2.64.

Step-by-step explanation:

The test statistic is:

[tex]t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]

In which X is the sample mean, [tex]\mu[/tex] is the expected(claimed) mean, [tex]\sigma[/tex] is the standard deviation and n is the size of the sample.

An automobile manufacturer claims that its van has a 40.3 miles/gallon (MPG) rating.

This means that [tex]\mu = 40.3[/tex]

After testing 250 vans, they found a mean MPG of 39.9. Assume the standard deviation is known to be 2.4.

This means, respectively, that:

[tex]n = 250, X = 39.9, \sigma = 2.4[/tex]

So

[tex]t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]

[tex]t = \frac{39.9 - 40.3}{\frac{2.4}{\sqrt{250}}}[/tex]

[tex]t = -2.64[/tex]

The value of the test statistic is -2.64.

Answer:

6xy(x+2y)

Step-by-step explanation:

6x²y+12xy²

The GCF between 6 and 12 is 6. Factor out 6.

= 6(x²y+2xy²)

The GCF between x² and x is x. Factor out x.

= 6x(xy+2y²)

The GCF between y and y² is y. Factor out y.

= 6xy(x+2y)

Therefore, the GCF of the expression is 6xy and the factored expression is 6xy(x+2y).

I hope this helps!

Answer:

b

Step-by-step explanation:

Answer:

M=1

Step-by-step explanation:

2m = 7/2 - 3/2

2m= 4/2

2m=2

M=2/2

M=1

Answer:

[tex]-1/x^2[/tex]

Step-by-step explanation:

First, let's simplify the expression on the right:

[tex]1/\sqrt{x^2}=1/x[/tex]

Next, rewriting 1/x as x⁻¹, we can use the power rule to differentiate both sides with respect to x:

[tex]y=x^{-1}\\dy/dx=d/dx(x^{-1})\\dy/dx=-x^{-2}=-1/x^2[/tex]

Answer:

15

Step-by-step explanation:

t¡yesç

Answer:

b.nun1

Step-by-step explanation:

Answer:

I cant give you a linear graph but i can give you the equation and you can graph it.   y=20x+450

Step-by-step explanation:

Answer:

Y = -20x + 450.

Step-by-step explanation:

Answer:

there a 42 days in 6 weeks

Step-by-step explanation:

multiply 6 x 7= 42

Answer:

i think its A

Step-by-step explanation:

Answer: 135

Step-by-step explanation:

Answer:

$135

Step-by-step explanation:

Answer:

Step-by-step explanation:

5×0.5^(9/3.66) = 0.9 gram

0.9 gm of radium-224 would remain after 9 days.

A radionuclide's half-life is the amount of time it takes for half of its radioactive atoms to decay. A good rule of thumb is that you will have less radiation than 1% of the original amount after seven half-lives.

We have,

The half-life of radium-224 is approximately 3.66 days.

Amount of radium- 224 to be decayed= 5 gm

So, the amount of radius-224 that remained after 9 days are

= 5 × [tex]0.5^{(9/3.66)[/tex]

= 5 x 0.1818

= 0.9 gram

Thus, the remaining amount is 0.9 gm.

Learn more about Half life here:

https://brainly.com/question/24710827

#SPJ2

Answer:

i dont know

Step-by-step explanation:

lol

Answer:

(20 + 1) + G

Step-by-step explanation:

Answer:

um

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

Edge

The required figure has been attached below could be the result of dilating a given triangle with a scale factor greater than 1. The correct answer would be an option (C).

A point is transformed when it is moved from where it was originally to a new location. Translation, rotation, reflection, and dilation are examples of different transformations.

The triangle has points (0, 0), (0, 3), and (6, 0) which are given in the question.

As per option (C), we have

On a coordinate plane, a triangle has points (0, 0), (0, 5), and (10, 0).

This result of dilating a given triangle with a scale factor greater than 1.

The required figure has been attached below which represents the dilation.

The correct answer would be an option (C).

To learn more about the transformations click here :

https://brainly.com/question/28029674

#SPJ6

Answer:

The ant has to crawl an approximate distance of 29mm

Step-by-step explanation:

Given

[tex]Volume = 8792mm^3[/tex]

[tex]r = 20mm[/tex] --- radius

See attachment

Required

Distance the ant has to crawl (i.e. the slant height)

First, we calculate the height of the hill

The volume of a cone is:

[tex]Volume = \frac{1}{3}\pi r^2h[/tex]

[tex]8792 = \frac{1}{3} * \frac{22}{7} * 20^2*h[/tex]

[tex]8792 = \frac{1}{3} * \frac{22}{7} * 400*h[/tex]

[tex]8792 = \frac{22* 400}{3*7} *h[/tex]

Make h the subject

[tex]h = \frac{8792 * 3 * 7}{22 * 400}[/tex]

[tex]h = \frac{184632}{8800}[/tex]

[tex]h = 20.98mm[/tex]

To calculate the slant height (s), we apply Pythagoras theorem

[tex]s^2=h^2 + r^2[/tex]

[tex]s^2=20.98^2 +20^2[/tex]

[tex]s^2=840.1604[/tex]

[tex]s=\sqrt{840.1604[/tex]

[tex]s=28.9855205232[/tex]

[tex]s= 29mm[/tex] --- approximated

Answer:

A (-4,3)

Step-by-step explanation:

Answer:

(-4,3)

Step-by-step explanation:

know that left and right is the x axis we start from there. left is negative right is positive, so I know 4 unit left is -4.

knowing that up and down is the y axis and y axis always comes second. up is positive down is negative. so I know that 3 units up is positive.

thats how we got( -4,3)

Answer:

A - both correct

Step-by-ste

Answer:

Step-by-step explanation:

Did you get the answer?

Answer:

h=[tex]\frac{12}{23}[/tex]

h=0.52173913043

Step-by-step explanation:

23h=12

divide 12 by 23

h=[tex]\frac{12}{23}[/tex]

h=0.52173913043

Hope this helps! :)

Answer:

it will be 1.91 or if want rounded to nearest tenth it will be 1.9

Step-by-step explanation:

dont have a explanation nut i hopes this help.

Answer:

i think so option b is the correct option.

Step-by-step explanation:

because 3+7=10 not 11.

Answer:

[tex]62in^2[/tex]

Step-by-step explanation:

Formula of total surface area of a prism:

[tex]2(lb+bh+lh)[/tex]

= 2[(7x3)+(1x3)+(1x7)]

= 2[21+3+7]

= 2 x 31

= [tex]62in^2[/tex]

Answer:

l = large cups       amount of large cups = 16 x  ounces

small cups = 2x     amount of small cups = 8 (2x)      summed = 320 ounces

16x      +     8 (2x)       =    320        solve for 'x' the number of 16 ounce cups, the 8 ounce cups = 2x

Step-by-step explanation:

l = large cups       amount of large cups = 16 x  ounces

small cups = 2x     amount of small cups = 8 (2x)      summed = 320 ounces

16x      +     8 (2x)       =    320        solve for 'x' the number of 16 ounce cups, the 8 ounce cups = 2x

false it starts from 1 and continues

Answer:

False because natural numbers start from 1

Answer:

Domain: [-4, ∞]

Range: [-6, ∞]

Step-by-step explanation:

The domain is the set of the possible x values

The range is the set of the possible y values.

In the graph, we can see that the function cuts in a given part. We can see that for the x-values, the smallest one is x = -4, and then the function extends to the right (we see no limit at the right, then there is none)

This means that the domain is:

D: [-4, ∞]

For the y-values, the smallest value is when x = -4, and the y-value is -6

Then we can see that, as x increases, the same happens for y.

Then the range is:

R: [-6, ∞]

Answer:

1.859 x 10^-4

Step-by-step explanation:

To the -4 power means to move the decimal place to the right 4 spaces.