If f(x)=x^2-3x,find f(-1.8). Show all work

Answers

Answer 1
Answer:  f(-1.8) =  8.6  .
____________________________________________________

Basically, plug in "(-1.8)" for "x" ; and solve:

Given:  f(x) = x² − 3x ;
____________________________________________________
            f(-1.8) = (-1.8)²  −  3(-1.8) ;

            f(-1.8) = [(-1.8)*(-1.8)]  − [3(-1.8)] ;

            f(-1.8) =  3.24  − (-5.4) ;
    
            f(-1.8) =  3.24  +  5.4 ;

            f(-1.8) =  8.6  .
____________________________________________________
            
Answer 2

The value of f(x) = x²-3x at x = -1.8 is -2.16.

What is a quadratic function?

A polynomial function with one or more variables, where the largest exponent of the variable is two, is referred to as a quadratic function. In other terms, a "polynomial function of degree 2" is a quadratic function.

We have the quadratic function:

f(x) = x²-3x

So, to find the value at x = -1.8:

Substitute the value to the function.

f(-1.8) = (-1.8)²-3(-1.8)

f(-1.8) = 3.24 - 5.4

f(-1.8) = -2.16

Therefore, the value is -2.16.

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Related Questions

write the ratio six to seven in other ways

Answers

ratios can be written in 3 ways :
a to b
a/b
a:b

so ur ratio 6 to 7 can be written as 6/7 or 6:7
As a fraction form
The two dotes :
_to_

The grades received on a test by twenty students were 100, 55, 75, 80, 65, 65, 95, 90, 80, 45, 40, 50, 85, 85, 85, 80, 80, 70, 65, and 60. What is the average of these grades?
A.) 70.5
B.) 72.5
C.) 77
D.) 80.3
E.) 100

Answers

To find the average of a set of numbers you add them all together. Then divide by the amount of numbers
B.72.5 , because if you add all those numbers and divide it by how many number there are(there's 20 numbers) you'll get 72.5

Graph Jkl and its image after a reflection in the given line J(5,3), K(1,-2), l(-3,4); y-axis

Answers

The reflection (x,y) over the y-axis is (-x,y)
So this yields J(-5,3), K(-1,-2), I(3,4)

When a shape is reflected, it must be reflected across a line.

See attachment for the graphs of JKL and the image of JKL

The coordinates of JKL are given as:

[tex]J = (5,3)[/tex]

[tex]K = (1,-2)[/tex]

[tex]L = (-3,4)[/tex]

The rule of reflection across the y-axis is:

[tex](x,y) \to (-x,y)[/tex]

So, we have:

[tex]J' =(-5,3)[/tex]

[tex]K' =(-1,-2)[/tex]

[tex]L' = (3,4)[/tex]

See attachment for the graphs of JKL and the image of JKL

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Find the area of the shaded region. Show all work in order to receive credit.

Answers

area of square = 14^2 = 196 square cm

 area of circle = 3.14 *7^2 = 153.86 square cm


196 - 153.86 = 42.14 square cm is shaded

1/3(9-6m)+1/4(12m-8)

Answers

Answer:

[tex]m+1[/tex]

Step-by-step explanation:

The question is

Simplify the expression

we have

[tex]\frac{1}{3}(9-6m)+\frac{1}{4}(12m-8)[/tex]

using the distributive property

[tex]\frac{1}{3}(9)-\frac{1}{3}(6m)+\frac{1}{4}(12m)-\frac{1}{4}(8)[/tex]

[tex]3-2m+3m-2[/tex]

Combine like terms

[tex]m+1[/tex]

if last years sales were $200,000 and this years increase was 250% how much are this years sales

Answers

This years sales is 240,000 dollars





Answer:

$700000

Step-by-step explanation:

We are given that last year sales=$200,000

This year sales  increases=250%

We have to find the earn money from this year sales

Let x be the earn money in this year

According to question

[tex]\frac{250}{100}\times 200000+200000=x[/tex]

[tex]x=500000+200000=700000[/tex]

Hence, this year sales=$700000

solve for n

4n + 2 = 6 (1/3n - 2/3)

Answers

See the picture above for the answer :)

The solution of expression for the value of n is, n = - 3.

Used the concept of expression that states,

Mathematical expression is defined as the collection of numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

Given that,

The expression is,

[tex]4n + 2 = 6 (\dfrac{1}{3} n - \dfrac{2}{3} )[/tex]

Now simplify the expression by combining like terms and apply the distributive property as,

[tex]4n + 2 = 6 (\dfrac{1}{3} n - \dfrac{2}{3} )[/tex]

Apply distributive property,

[tex]4n + 2 = (\dfrac{6}{3} n - \dfrac{12}{3} )[/tex]

[tex]4n + 2 = 2n - 4[/tex]

Combine like terms,

[tex]4n - 2n = - 4 - 2\\[/tex]

[tex]2n = - 6\\[/tex]

[tex]n = - 3[/tex]

Therefore, the value of n is - 3.

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If someone could help me!

Answers

The answer is choice C) All real numbers from 0 through 35.

The domain is the set of allowed inputs (x). The points on this graph have x coordinates that span from x = 0 to x = 35. Because x is time in minutes, we can have fractions of a minute (eg: x = 7.5 ---> 7 and a half minutes). So we won't just have integers. 

What is the period of the function y=-4sin (2/3x-pi?3)?

Answers

2/3 x = 2 pi
x = 2pi × 3/2 = 3pi

period = 3pi

What is the converse of the linear pairs theorem

Answers

The converse of a logicalstatement is a s tatement formed by reversing the parts of the statement.

For example, the logical statement "A implies B" has a converse of "B implies A"

The linear pairs theorem states that "if two angles form a linear pair, then they are supplementary".

The converse of the linear pairs theorem is therefore, "if two angles are suplementary, then they form a linear pair".

Simplify
Y+ z -2y. If y=4 and z=2

Answers

y + z - 2y
(4) + (2) - 2(4)
4 + 2 - 8
6-8
-2

Hope this helped!

How many license plates can be made using 2 digits then 5 letters if repeated digits and letters are not allowed?

Answers

In this question, we made a license that does not allow repeated digit and letter. That means the probability count of letter and digit will be decreased by 1 for every roll.
There is 10 kinds of digits (0-9) and 26 kinds of letters (a to z). So, 2 digits and 5 letter would be:
(10 * 9) * (26 * 25 * 24 * 23 * 22)= 710424000 kinds of license plates

A taxi charges $2.50 for the first mile and $0.40 for each mile after that. The expression below shows how to find the total cost, in dollars, of a 20-mile taxi ride. 2.50 + 0.40 (20 - 1) What is the cost of the ride?

Answers

Answer:

Step-by-step explanation:

Alright , lets get started.

The first mile charge = [tex]$2.5[/tex]

Total miles taxi covered = [tex]20[/tex]

Subtracting first mile frm the total ride = [tex](20-1)[/tex]

Means the fare will apply on this mile.

So, cost of total ride = [tex]2.5 + 0.4 (20-1)[/tex]

cost of total ride = [tex]2.5+0.4*19[/tex]

cost of total ride = [tex]2.5+7.6[/tex]

cost of total ride = [tex]10.1[/tex]

The answer is $ 10.1 .   :    Answer

Hope it will help :)

Answer:

10.10 (B)

Step-by-step explanation:

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Which mathematical property is demonstrated?

40 * (25 * 74) = (40 * 25) * 74



Question 3 options:

associative property of addition


commutative property of multiplication


commutative property of addition


associative property of multiplication

Answers

[tex]40 * (25 * 74) = (40 * 25) * 74 40 * (1850) = (1000) * 74 40 * (1850) = (1000) * 74 74,000 = 74,000[/tex]

Knowing this, we can easily conclude that this is demonstrating the associative property of multiplication. The associative property of multiplication states that the product is the same regardless of their grouping. In this case, after simplifying the expression given, we can see that indeed the products are the same hence that fact that they have different grouping. 

Answer:

Step-by-step explanation:

The associative property of multiplication states that the product is the same regardless of their grouping. In this case, after simplifying the expression given, we can see that indeed the products are the same hence that fact that they have different grouping

What is the distance between -3 and 6?

-9

-3

3

9

Answers

9 is the answer to your question!
Hope this helps!

Compare and contrast equation notation and function notation

Answers

An equation is a relationship whose primary use is solving for a value.
An equation makes use of the equality (=) sign.
An example of an equation is x + 6 = 46.

A function is a mathematical machine whose purpose is to transform input variables into output according to the function rule.
A function can be described by an equation, a graph, a program, a table, etc.
An example of a function is y = 2x - 5.

Use the graph below to fill in the blank with the correct number

Answers

Thanks for the question!

The answer is 1. If we go to where the x-coordinate is 1, we see that there is a point with a y-coordinate of 1.

Hope this helps!

A person 6 ft tall casts a shadow 5​ft long. at the same​ time, a nearby tree casts a shadow 31 ft long. find the height of the tree

Answers

Therefore, the tree's height is 37.2 feet.

We can use proportions to find the height of the tree based on the shadow it casts and compare it to the height and shadow of a known object (in this case, a person). Given that a person 6 ft tall casts a 5 ft long shadow, we can set up a proportion with the tree's 31 ft long shadow to find its height. The formula we use for this comparison is:

Person's Height / Person's Shadow = Tree's Height / Tree's Shadow

Plugging in the numbers:

6 ft / 5 ft = Tree's Height / 31 ft

Now, we solve for the Tree's Height:

6 ft * (31 ft / 5 ft) = Tree's Height

Tree's Height = 37.2 ft

Therefore, the height of the tree is 37.2 feet.

If h(x) = 5 for the function h(x) = 2x + 1, what is the value of x?

Answers

Well since h(x) = 5 and h(x) = 2x+1, we know that 5 = 2x+1. Now we just solve.

5 = 2x+1
4 = 2x
2 = x

We can check this by putting x = 2 in the original equation.

5 = 2(2)+1  Which is true.

If you have any questions just ask!

Take -4 + 3a 2 from 7a - a 2

Answers

the answer would be from -a²+4a+4 this is the combined form

then to simplify this to get 2

to simpify you must move all terms to the left side,then set equal to 0 then set each factor to equal zero


Subtracting [tex]\( -4 + 3a^2 \)[/tex] from [tex]\( 7a - a^2 \)[/tex] yields [tex]\( 7a - 3a^2 + 4 - a^2 \)[/tex], after distributing the subtraction and combining like terms.

To subtract [tex]\( -4 + 3a^2 \)[/tex] from [tex]\( 7a - a^2 \)[/tex], we need to distribute the subtraction across both terms in [tex]\( 7a - a^2 \)[/tex] and then combine like terms:

[tex]\[ (7a - a^2) - (-4 + 3a^2) \][/tex]

Distributing the subtraction:

[tex]\[ 7a - a^2 + 4 - 3a^2 \][/tex]

Now, combine like terms:

[tex]\[ (7a - 3a^2) + (4 - a^2) \][/tex]

So, the result of subtracting [tex]\( -4 + 3a^2 \)[/tex] from [tex]\( 7a - a^2 \)[/tex] is [tex]\( 7a - 3a^2 + 4 - a^2 \)[/tex].

Comlpete Question:

Take [tex]\( -4 + 3a^2 \)[/tex] from [tex]\( 7a - a^2 \)[/tex]

Solve the following system of linear equations. 3x + 2y = 10 2x + 3y = 15/2 No solution y = (-3/2)x + 5 x = 3, y = -1/2 x = 3, y = 1/2

Answers

The solution of the equations is the point(3,1/2)

What is the solution to a linear equation?

The solution of a linear equation is defined as the points, in which the lines represent the intersection of two linear equations. In other words, the solution set of the system of linear equations is the set of all possible values to the variables that satisfies the given linear equation.

Given here: 3x + 2y = 10 2x + 3y = 15/2  Solving the two equations we get

the solution as x=3 and y=1/2

Hence, the solution of the equations is the point(3,1/2)

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Final answer:

Using the elimination method, we solved the system of linear equations to find that the solution is x = 3 and y = 1/2.

Explanation:

The student is asking us to solve a system of linear equations. The equations given are:

3x + 2y = 10

2x + 3y = 15/2

To solve these equations, we can use either substitution or elimination method. Let's go ahead with the elimination method to find the values of x and y.

Multiply the first equation by 3 and the second equation by 2 to make the coefficients of x the same:

9x + 6y = 30 (multiplying the first equation by 3)

4x + 6y = 15 (multiplying the second equation by 2)

Now, subtract the second equation from the first equation to eliminate y:

9x + 6y - (4x + 6y) = 30 - 15

5x = 15

x = 3

Now plug x=3 into the first original equation:

3(3) + 2y = 10

9 + 2y = 10

2y = 1

y = 1/2

Therefore, the solution to the system of equations is x = 3 and y = 1/2.

You have $200 in your savings account. You take $35 from your account each week for four weeks. How much is left in your account at the end of the four weeks?

Answers

It would be $60!
3x4=140
140-200=60
200-140=60
35 dollars * 4 weeks = 140 dollars
subract this from 200, and at the end of the week you will have 60 dollars.

The first aircraft has 75 more seats than the second aircraft. The third aircraft has 49 fewer seats than the second aircraft. If their total number of seats is 401​, find the number of seats for each aircraft.

Answers

1st = 75+x

2nd = x

3rd = x-49


401 = 75 +x+ x+ +x-49

401 = 75+3x-49

401 = 3x+26

375=3x

x=375/3 = 125


1st = 125+75 = 200

2nd = 125

3rd = 125-49 = 76

200 + 125 +76 = 401

TRUE OR FALSE:if a function uses variables other than x and y for its input and output variables, you take the original and solve for the output variable to find the inverse.

Answers

Answer: False for apex

Step-by-step explanation: 1. because it is

2. for the junior monitor that deleted my answer, back off.

Answer:

false for apex

Step-by-step explanation:

Find the x-intercept of parabola with the vertex (-7,45) and y-intercept (0,-200). Write your answer in this form (x, y) , (x, y)

Answers

the equation of the parabola would be 

y = a(x + 7)^2  + 45   where a is some conatant

when x = 0   y = -200 so:-

-200 = a*7^2 + 45

a  = -200 - 45  / 49  =  -5 

so the equation of the parabola is y = -5 (x + 7)^2 + 45

Solving for x intercepts:-

(x+7)^2  =  -45/-5 = 9

x + 7 = +/- 3

x  = -10 ,  -4

x intercepts at (-10,0) and (-4,0) Answer

Answer:

(-10,0),(-4,0) for Plato/Edmentum Users

Step-by-step explanation:

Have a great day

There are 3 drama movies 8 comedy movies and 4 action movies what's the ratio of dramas to movies ?

Answers

3:12 or 1:4 write both and ask which one is better to use
3:15, 3/15, or 3 to 15.

How I got that was add all of the 3 types of movies together. 3+8+4= 15. And there are 3 drama movies. So I looked at "the ratio of DRAMA, to MOVIES.", and I wrote down what was first. 

I'm not sure if I made sense, sorry. But 

What is the solution to the compound inequality in interval notation? 2(x+3)>6 or 2x+3≤−7

Answers

for 2(x+3)>6 x would = 0 and for 2x+3<-7  x would = -5



hope this helps

Answer:  The required solution in interval notation is [tex](0,\infty)U(-\infty,-5].[/tex]

Step-by-step explanation:  We are given to find the solution to the following compound inequality in interval notation :

[tex]2(x+3)>6~or~2x+3\leq -7~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]

To find the solution to (i), we must solve both the parts separately.

The inequality (i) can be solved as follows :

[tex]2(x+3)>6\\\\\Rightarrow x+3>\dfrac{6}{2}\\\\\Rightarrow x+3>3\\\\\Rightarrow x>3-3\\\\\Rightarrow x>0\\\\\Rightarrow x\epsilon (0,\infty)[/tex]

or

[tex]2x+3\leq-7\\\\\Rightarrow 2x\leq-7-3\\\\\Rightarrow 2x\leq -10\\\\\Rightarrow x\leq -\dfrac{10}{2}\\\\\Rightarrow x\leq-5\\\\\Rightarrow x\epsilon(-\infty,-5].[/tex]

Thus, the required solution in interval notation is [tex](0,\infty)U(-\infty,-5].[/tex]

How you will go about preparing yourself to confidently teach numeracy?

Answers

In preparation of yourself in having to teach numeracy, it is best to substantiate if learning the numeracy will have benefits or advantages, such as having to help other people or even empower them as an adult people learning and think of ways how will this could be important to them.

If it takes six men six days to dig six holes, how long will it take one man to dig half a hole?

Answers

It will take 3 days for 1 man to dig half of that complete hole.

What are direct and inverse proportion ?

Direct proportion if increase in one quantity also results in increase in another quantity for example price and weight of something.

Inverse proportion is when increase in one quantity results in decrease in another quantity for example time is inversely proportional to (speed when distance is constant.

According to the given question

6 men are working together then it takes them 6 days to dig 6 holes.

∴ Number of men days = 6 days × 6 men = 36 men days

So, in 36 men days 6 holes are dug. Now the men days and the number of holes being dug are in direct proportion with one another.

Hence number of men-days required to dig one hole

= 36/6 men days

= 6 men days

∴ No. of men days required to dig half a hole

= 6/2

= 3 men days

So, It takes 1 man 3 days to dig half a hole.

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What is the factored form of 6n4 – 24n3 + 18n?

Answers

6n^4-24n^3+18n
6n(n^3-4n^2+3)
6n(n-1)(n^2-3n-3)

Answer:

Step-by-step explanation:

Notice to facts:

The numbers 6, -4 and 18 have a common factor: 6.In all the terms (n⁴, n³, n) are a factor n.

The expression has a common factor 6n. Then,

6n⁴-24n³+18n = 6n(n³-4n²+3).

In order to factor the term n³-4n²+3 we use Ruffini-Horner rule, which gives us that

n³-4n²+3 = (n-1)(n²-3n-3).

Then,

6n⁴-24n³+18n = 6n(n³-4n²+3) = 6n(n-1)(n²-3n-3).

If you don't know the formula for the general solution of second degree equation, you are done. Otherwise, it is only to use it in the quadratic factor.

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