If y=-2x^3+4x+9, what is y when x=3?

Answer:

w<-28

Step-by-step explanation:

multiply both sides by 2 : -6 > w +22

subtract 22 : w < -28

The quadratic function is increasing on the interval:

(-∞, 0)

Here we want to see on which intervals is the quadratic function increasing.

Or function is:

f(x) = 5 - 2x^2

Notice that we have a negative leading coefficient, which means that the parabola opens downwards.

Then the function will be increasing from negative infinity to the x-value of the vertex.

Remember that for the general quadratic:

y = a*x^2 + b*x + c

the x-value of the vertex is:

x = -b/2a

In this case we don't have a linear term, so b = 0, then the vertex is at x = 0.

Which means that the function is increasing on the interval (-∞, 0)

Learn more about quadratic functions:

https://brainly.com/question/1214333

#SPJ1

Answer:

x=12 y=15

Step-by-step explanation:

15-9=6 6+6=12

18-9=9 6+9=15

The first derivative by implicit differentiation of 2 · x⁶ + 5 · x⁴ · y - 7 · x · y⁶ = 8 is y' = (7 · y⁶ - 20 · x³ · y - 12 · x⁵) / (5 · x⁴ - 42 · x · y⁵).

Implicit differentiation is a differentiation method for implicit functions that combines chain rule and derivative rules. First, define the original function:

2 · x⁶ + 5 · x⁴ · y - 7 · x · y⁶ = 8

Second, use chain rule and derivative rules in the expression of the previous step:

12 · x⁵ + 20 · x³ · y + 5 · x⁴ · y' - 7 · y⁶ - 42 · x · y⁵ · y' = 0

Third, clear y' within the resulting equation:

12 · x⁵ + 20 · x³ · y - 7 · y⁶ + (5 · x⁴ - 42 · x · y⁵) · y' = 0

(5 · x⁴ - 42 · x · y⁵) · y' = 7 · y⁶ - 20 · x³ · y - 12 · x⁵

y' = (7 · y⁶ - 20 · x³ · y - 12 · x⁵) / (5 · x⁴ - 42 · x · y⁵)

The first derivative is y' = (7 · y⁶ - 20 · x³ · y - 12 · x⁵) / (5 · x⁴ - 42 · x · y⁵).

To learn more on implicit differentiation: https://brainly.com/question/14027997

#SPJ1

The percent of the decrease in the size of the sugar order is 40%.

According to the question,

We have the following information:

Sweet Treats Bakery ordered 1,090 kilograms of sugar. This time, the bakery is ordering 654 kilograms.

We know that following formula is used to find the percent decrease:

100*(original amount-final amount)/original amount

(More to know: the same formula is used to find the percent increase. It can used to find any percent increase or decrease given that the final and initial amount or price is given.)

100(1090-654)/1090

100*436/1090

40%

Hence, the percent of the decrease in the size of the sugar order is 40%.

To know more about percent of the decrease here

https://brainly.com/question/2913116

#SPJ1

Answer: 14 mph

Step-by-step explanation:

Let x = the speed of the boat in still water.

Then the speed of the boat relative the bank of the river is u-5 km/hb when it moves upstream, and u+5 when it moves downstream.

We can write the basic equation for travel and distance problems

Time = Distance/Speed in the form  

t = 9/x-5   for moving upstream, and

t = 19/x+5 for moving downstream.

Since the left side, t, is the same in both equations, you get a single equation for u

9/x-5 = 19/x+5

To solve it, multiply both sides by the product (x-5)*(x+5) and simplify:

9*(x+5) = 19*(x-5),

9x + 45 = 19x - 95,

45 + 95 = 19x - 9x,

10x = 140,

u = 140/10 = 14 mph.

hope this helps

Answer:

N = 20

Step-by-step explanation:

5/3 = 1 2/3

20/12 = 1 8/20

They are equivalent

Answer:

[tex]\textsf{(a)} \quad \boxed{9a-3}[/tex]

[tex]\textsf{(b)} \quad \boxed{-9a-3}[/tex]

[tex]\textsf{(c)} \quad \boxed{-9a+3}[/tex]

Step-by-step explanation:

Given function:

[tex]f(x) = 9x - 3[/tex]

Part (a)

To find f(a), substitute x = a into the function:

[tex]\implies f(a)=9a-3[/tex]

Part (b)

To find f(-a), substitute x = -a into the function:

[tex]\implies f(-a)=-9a-3[/tex]

Part (c)

To find -f(a), first substitute x = a into the function:

[tex]\implies f(a)=9a-3[/tex]

Then make the function negative:

[tex]\begin{aligned}\implies -f(a)&=-(9a-3)\\&=-9a+3 \end{aligned}[/tex]

Answer:

4/9

Step-by-step explanation:

Based on the given conditions, formulate: 12 division symbol(12 +15)

Calculate the sum or difference: 12/27

Cross out the common factor: 4/9

get the result:

Answer: 4/9

Answer:10,000

Step-by-step explanation:

The values of H(-7)=3, H(-2)=3, H(3)=5, H(9)=11 using the given equations by substituting the values.

The definition of an equation in algebra is a mathematical statement that demonstrates the equality of two mathematical expressions. For instance, the equation 3x + 5 = 14 consists of the two expressions 3x + 5 and 14, which are separated by the 'equal' sign. A mathematical statement known as an equation is made up of two expressions joined together by the equal sign. a formula that expresses the connection between two expressions on either side of a sign. Typically, it has a single variable and an equal sign.

Here,

H(x)= {-5x-13 for x<-7

          3 for -7<=x< 3

          x+2 for x=> 3}

when x=-7,

H(x)=3

when x=-2,

H(x)=3

when x=3,

H(x)=x+2

H(x)=5

when x=9,

H(x)=x+2

H(x)=11

H(-7)=3, H(-2)=3, H(3)=5, H(9)=11 when the values are substituted under the conditions stated for the given equation.

To know more about equation,

https://brainly.com/question/10413253?referrer=searchResults

#SPJ1

Answer:

123

Step-by-step explanation:

2x square = 2.7 square = 98

98 + 4y = 98 + 4.9 = 98 + 36 = 134

134 - z = 134 - 11 = 123

Ur Wellcome ;)

The probability with replacement is = 1/16

The probability without replacement is= 5/16

What do you mean by probability with replacement?

When the results must be put back into the sample space, the probability with replacement is utilized. This means that once an item is selected, it is replaced in the sample space, keeping the sample space's total number of elements constant.

Since cards should be replaced, 5 lions or 5 birds

so, the probability is

= 5/20 ÷ 5/20

=1/16

without replacement,

since cards should not be put back, for the second draw only 19 cards are left

so, the probability is

=5÷20 × 5÷19

=5/16

Hence ,

The probability with replacement is = 1/16

The probability without replacement is= 5/16

to learn more about probability from the given link,

https://brainly.com/question/24756209

#SPJ1

The mean of the data set is 22.1 , and the sample proportion of numbers less than the mean is 46.67 %

The mean is the average value which can be calculated by dividing the sum of observations by the number of observations

Mean = Sum of observations/the number of observations

Mean of the data set is calculated by adding all numbers and dividing it with total number sample data.

Then Adding all the numbers;

25.5 + 26 +18.2 +15.3 + 28.5 + 27 + 20.7 +20.2 +26.1 +18.2 +21.4 +17.9 +24.3 +22.6+ 19.6 =331.5

Now Dividing by total,

331.5/15 =22.1

Mean =22.1

The sample proportion of numbers less than the mean will be;

= (7/15 ) 100

=46.67%

Learn more about mean and median;

https://brainly.com/question/17060266

#SPJ1

The complete question is;

For this question, any non-integer answers should be entered as decimals, rounded to the hundredths place.

Consider this data set. The mean of the data set is ___ , and the sample proportion of numbers less than the mean is ___%

The error in this answer is that : The sum of angle of triangle is 180°

What is Triangle?

A polygon with three edges and three vertices is called a triangle. It is one of the fundamental geometric shapes. Triangle ABC is the designation for a triangle with vertices A, B, and C. In Euclidean geometry, any three points that are not collinear produce a distinct triangle and a distinct plane.

Since, we know that Angle sum property of triangle is

∠A + ∠B + ∠C = 180°

Now, let ∠A = 115, ∠B = 39 and ∠C = m∠1

Substituting the value, we get

115° + 39° + m∠1 = 180°

154° + m∠1 = 180°

m∠1 = 180 - 154

m∠1 = 26°

Thus, m∠1 = 26°

Hence, The error for finding m∠1 is that angle sum of the triangle is equal to 180° and not 360°

To learn more about Triangle click on the link

https://brainly.com/question/1058720

#SPJ1

Answer:

Domain: (neg infinity, pos infinity)

Range: (pos infinity, 3]

Step-by-step explanation:

The correct system of equations is 5x-y=2,x-5y=10

In order to find the system of equations of the graph, we have to check the solution in the graph and then check for the system of equations that gives the same value.

Looking at the graph, the values of x and y at the point of intersection is the solution. Thus:

x =  0 and y = -2

Let's check the equations now:

5x+3y=-6, 3x+5y=-10

Solve for x and y using elimination

3 (5x+3y=-6)

5 (3x+5y=-10)

15x + 9y = -18

15x + 25y = -50

-6y = 32

y = -32/6 = -16/3 (This cannot be the system)

3x-5y=10, x-5y=-10

3x-5y = 10

x-5y = -10

2x = 20

x = 20/2 = 10  (This cannot be the system)

5x-y=2,x-5y=10

1(5x-y=2)

5(x-5y=10)

5x -y =2

5x-25y = 50

24y = -48

y = -48/24 = -2

put y = -2 into 5x -y =2:

5x -(-2) =2

5x + 2 = 2

5x = 0

x = 0

Therefore, 5x-y=2,x-5y=10 is the system of equations. The 3rd option is the answer. Move it to the box

Learn more about system of equations on:

https://brainly.com/question/13729904

#SPJ1

The x- and y-intercept of the line -1.2x + 8.2y = 39.36 are -32.8 and 4.8

An intercept is a point at which the line crosses the axis of a graph. The point at which the line crosses the x-axis is known as the x-intercept, whereas if a line crosses the y-axis at a point, then the point will be the y-intercept.

Here we have,

-1.2x + 8.2y = 39.36

To find x - intercept substitute y = 0

=> -1.2x + 8.2(0) = 39.36

=> -1.2x = 39.36

=> x = 39.36/1.2

=> x = -32.8

To find y - intercept substitute x = 0

=> -1.2(0) + 8.2y = 39.36

=> 8.2y = 39.36

=> y = 39.36/8.2

=> y = 4.8  

Therefore

The x- and y-intercept of the line -1.2x + 8.2y = 39.36 are -32.8 and 4.8

Learn more about x and y intercepts at

https://brainly.com/question/14886566

#SPJ1  

Answer:

49 degrees

Step-by-step explanation:

Answer:

4.7 cm

Step-by-step explanation:

I took the test

The amount of money that Lena needs to put each quarter for the annuity to have a total value of $96,000 is $953.45.

An annuity is when a series of payment is made either at the beginning of a period or at the end of a period over a period of time.

An ordinary annuity is when the payment is made at the end of the period. When the interest is compounded quarterly, it means that four times in a year, the amount that is invested and the interest that has already being earned increase in value.

The formula that can be used to determine the quarterly payments is:

Payment = future value / annuity factor

Annuity factor = {[(1+r)^n] - 1} / r

Where:

Payment = $96,000 / [{(1.009^72) - 1} / 0.009]  = $953.45

To learn more about annuities, please check: https://brainly.com/question/24108530

#SPJ1

The quantity of sodium in the salt is 10.4 ounces

information from the problem

Table salt (sodium chloride, NaCl) is 40% sodium (Na) by weight

If a box of salt weighs 26 ounces, how much Na is in the box of salt

The question is a percentage problem, percentage deals with a fraction hundred and used as follows

40%

= 40 percent

= 40 / 100

= 0.4

The factor 0.4 of the total weight of the salt is what we calculate

the total number is 26 ounces

= 0.4 * 26

= 10.4

Learn more about percent here:

https://brainly.com/question/29230566

#SPJ1

Answer:  80% received, 20% lost.

Step-by-step explanation:  [tex]\frac{60}{300}[/tex] × [tex]\frac{x}{100}[/tex] = [tex]\frac{6000}{300}[/tex]     *Make sure to cross multiply!!*

——————————————6000 ÷ 300 = 20%

——————————————100 - 20 = 80% .

Therefore, the shop received 80% of the order because the other 20% are missing.

The width of the rectangular Hardee County, considering it's area, is given as follows:

21.23 miles.

The area of a rectangle of length l and width w is obtained by the multiplication of these dimensions, as follows:

Area = length x width.

For the rectangular Hardee County, the parameters are given as follows:

Considering the area and the length, the width is obtained as follows:

Area = length x width

30w = 637

w = 637/30

w = 21.23 miles.

(the area is in miles squared, hence both dimensions are in miles).

The problem is shown by the image at the end of the answer.

More can be learned about the area of a rectangle at https://brainly.com/question/10489198

#SPJ1

The ordered pair that is not a solution to the inequality y ≥ 2x² - 4x + 2 is:

(-1,6).

The inequality is given as follows:

y ≥ 2x² - 4x + 2.

Each ordered pair has the following format:

(x-coordinate, y-coordinate).

Then the numeric value of the inequality is going to be calculated for each ordered pair, as follows:

Then the numeric values of the inequality for each ordered pair are presented as follows:

The contradiction, that is, the statement which is false, is given at the following ordered pair:

(-1,6).

Hence it is not a solution to the given inequality.

The ordered pairs are given by the image shown at the end of the answer.

A similar exercise, also featuring inequalities, is presented at https://brainly.com/question/25275758

#SPJ1

Horizontal asymptotes of the given graph is given by y = -4.

As given in the question,

From the given graph we observed :

Value of each unit on x -axis is equal to 1

Value of each unit on y -axis is equal to 1.

For the standard equation of line y = mx + b

When input values tends to ∞ or -∞ graph approaches to infinity to both the ends.

Horizontal asymptote is given y = b as per the value of b .

Here in the given graph ,

When input values tends to to ∞ or -∞ graph approaches to infinity to both the ends then horizontal asymptote is given by y = -4.

Therefore, horizontal asymptotes of the given graph is given by y = -4.

Learn more about horizontal asymptotes here

brainly.com/question/4084552

#SPJ1

Answerx=7

Step-by-step explanation:

Answer: 18

Step-by-step explanation:  All you do is subtract 26 by 8 and you get 18. 18+8=26 :)

Answer:

P 717

Step-by-step explanation:

Fraction addition using algebra:

       Let the cost of bracelet =  x

          [tex]\sf Cost \ of \ pendent = \dfrac{3}{4}*Cost \ of \ bracelet[/tex]

                                   [tex]\sf = \dfrac{3}{4}x[/tex]

Cost of bracelet + cost of pendent = 413    

                      [tex]\sf x + \dfrac{3}{4}x = 413\\\\ \dfrac{4}{4}x+\dfrac{3}{4}x=413[/tex]

                                [tex]\sf \dfrac{7}{4}x=413[/tex]

Muliply both sides by 4,

                                [tex]\sf 4*\dfrac{7}{4}x = 413*4\\\\[/tex]

                                     7x  = 413 * 4

Now, divide both sides by 7

                                      [tex]\sf x = \dfrac{413*4}{7}\\\\ x = 59*4\\\\x = 236[/tex]

Cost of bracelet = P 236

Cost of pendent = 413 - 236

                            = P 177

Answer:

282 inches

Step-by-step explanation:



24*8+