-5a + b = 8
7a + 9b = -32​

Answer:

[tex]x \in \mathbb \: R[/tex]

Step-by-step explanation:

The given equation is:

[tex] - (2x + 2) - 1 = - x - (x + 3)[/tex]

We expand to get:

[tex] - 2x - 2 - 1 = - x - x - 3[/tex]

We group like terms to get:

[tex] - 2x + x + x = - 3 + 1 + 2[/tex]

We combine the like terms to obtain:

[tex] - 2x + 2x = - 3 + 3[/tex]

[tex] 0 = 0[/tex]

This is always true therefore the solution is infinite.

Answer:

1 and 7/8 chapter

Step-by-step explanation:

1 ÷ 1/5 = 5

3/8 x 5 = 15/8 or 1 7/8

Answer:

1 7/8 chapters

Step-by-step explanation:

Answer:

2 scoops

Step-by-step explanation:

Lester needs to add 2 scoops of flour of 1/3 cup measure.

We have Lester who needs to add 2/3 of a cup of flour but he only has a 1/3 cup measure.

We have to find out how many scoops of flour does Lester need to add.

Assume the number of scoops = x

Then -

10x = 100

x = 10

According to question, we have -

Amount of flour needed by Lester = 2/3

Size of Cup measure = 1/3

Assume that the the number of scoops of protein powder be y.

Then -

[tex]\frac{y}{3} = \frac{2}{3} \\\\y = \frac{2}{3} \times 3\\\\[/tex]

y = 2

Hence, Lester needs to add 2 scoops of flour 1/3 cup measure.

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Answer:

R = 8.31

Step-by-step explanation:

From the table choose a corresponding amount for Volume and pressure.  Plug it into the equation and solve for R.

Choosing the second row V = 16.62 and p = .5

p = R/V

.5=R/16.62

multiply both sides by 16.62 to isolate R

16.62(.5) = R

R = 8.31

Answer:8.31

Step-by-step explanation:

The right answer is Option C.

Step-by-step explanation:

A. 9/17 and 27/50

Using cross product;

[tex]\frac{9}{17}=\frac{27}{50}\\9*50=17*27\\450=459[/tex]

The ratio does not form proportion.

B. 12/35 and 24/75

[tex]\frac{12}{35}=\frac{24}{75}\\12*75=24*35\\900=840[/tex]

The ratio does not form proportion.

C. 15/55 and  33/121

[tex]\frac{15}{55}=\frac{33}{121}\\15*121=33*55\\1815=1815[/tex]

The ratio form a proportion.

D. 12/35 and 20/70​

[tex]\frac{12}{35}=\frac{20}{70}\\12*70=20*35\\840=700[/tex]

The ratio does not form proportion.

The right answer is Option C.

Keywords: ratio, proportion

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Answer:

(1, - 2 )

Step-by-step explanation:

Given the 2 equations

y = - 4x + 2 → (1)

y = 6x - 8 → (2)

Substitute y = 6x - 8 into (1)

6x - 8 = - 4x + 2 ( add 4x to both sides )

10x - 8 = 2 ( add 8 to both sides )

10x = 10 ( divide both sides by 10 )

x = 1

Substitute x = 1 into (2) for corresponding value of y

y = 6(1) - 8 = 6 - 8 = - 2

Solution is (1, - 2 )

Answer:

10x+15

Step-by-step explanation:

5(2x+3)=10x+15

Answer:

10x+15.

Step-by-step explanation:

Its just simplified.

5 times 2x is 10x

5 times 3 is 15.

Put it together 10x+15.

Answer:

D

Step-by-step explanation:

The line representing Bella has a steeper slope than Kofi's, so the slope of that line must be greater than 15.55.

Similarly, the line representing Elsie has a shallower slope than Kofi's, so the slope of that line must be less than 15.55.

The only option that fits is D.

The bakery made 3 batches of cookies and a total of 180 cookies.

To determine the number of batches of cookies the bakery made, we divide the total amount of flour used by the amount of flour used in each batch. The bakery used 5.25 cups of flour in total, and each batch requires 1.75 cups of flour. Therefore, the number of batches made is:

[tex]\[ \text{Number of batches} = \frac{\text{Total flour used}}{\text{Flour per batch}} = \frac{5.25}{1.75} \][/tex]

[tex]\[ \text{Number of batches} = 3 \][/tex]

Since there are 5 dozen cookies in each batch, we multiply the number of batches by the number of cookies per batch to find the total number of cookies made:

[tex]\[ \text{Total number of cookies} = \text{Number of batches} \times \text{Cookies per batch} \][/tex]

[tex]\[ \text{Total number of cookies} = 3 \times (5 \times 12) \][/tex]

[tex]\[ \text{Total number of cookies} = 3 \times 60 \][/tex]

[tex]\[ \text{Total number of cookies} = 180 \][/tex]

Thus, the bakery made 3 batches of cookies, resulting in a total of 180 cookies."

In a function, each "x" can only have one "y" number. A relation can still be a function if a y-value has more than one x-value.

Answer:

11. a)

The relationship represented by the graph is a function because it passes the vertical line test (VLT). Any vertical line you pass through the graph, it only "hits" one spot on the graph. For a relation to be a function, each x-value can only have one y-value. This means no hour can have two different amounts of bacteria.

b)

If there were the same number of bacteria for two consecutive hours, the graph would still represent a function. In this case, two values for "y" will have more than one value for "x". Although, each x-value still only has one y-value, so it's still a function.

Translation

Rigid motion occurs when you move figures without affecting the size or shape in order for the figure to be congruent in a new location.

The types of rigid motions are:

In this problem, you haven't provided any figure, but I've attached one below. As you can see, we have a triangle ΔABC that has been translated to a new location in order to match triangle ΔDEF. So any point (x, y) on the triangle is mapped following this rule:

[tex](x,y) \rightarrow (x+8,y+2)[/tex]

So the new vertices D,E,F will be:

[tex]A(-6,2) \rightarrow D(-6+8,2+2)=\boxed{D(2,4)} \\ \\ B(-6,6) \rightarrow E(-6+8,6+2)=\boxed{E(2,8)} \\ \\ C(-2,2) \rightarrow F(-2+8,2+2)=\boxed{F(6,4)}[/tex]

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Answer:

1,170,000

Step-by-step explanation:

The returns are 15% of 1,300,000.

15% of 1,300,000 = 15% * 1,300,000 = 0.15 * 1,300,000 = 195,000

In 1 month, 195,000 smartphones were returned.

In 6 months, 6 times as many smartphones were returned.

6 * 195,000 = 1,170,000

Answer: 1,170,000

Answer:

1,170,000 Smartphones were returned over a 6-month period.

Step-by-step explanation:

Ok, so to start off, 15% of 1,300,000 is 195,000. Now if everything remains the same over the next 5 months, you just need to multiply the 195,000 by 6 to get the 6 month return rate. This results in the number of 1,170,000 Smartphones Returned over a 6-month period.

Answer:

B is the correct answer

Step-by-step explanation:

use your calculator and or in the problem and it should give you a decimal just go to math. and click 1 and click enter again and it should give you a fraction

Answer:

0

Step-by-step explanation:

Answer:

The answer would be 0

Answer:

3x^3-18x^2+26x-8

Step-by-step explanation:

(x-4)(3x^2-6x+2)

3x^3-6x^2+2x-12x^2+24x-8

3x^3-18x^2+26x-8

Answer:

3x^3-18x^2+26x-8

Step-by-step explanation:

(x-4)(3x^2-6x+2)

3x^3-6x^2+2x-12x^2+24x-8

3x^3-18x^2+26x-8

Answer:

1170

Step-by-step explanation:

Answer:

x^2-3x-3=0

Step-by-step explanation:

x^2=3x+3

x^2-3x-3=0

Answer:

57=12+3d

d=number of days worked

Answer:

(57-12)3/x=15 days

x=57-12

Answer:

see explanation

Step-by-step explanation:

To find the x- intercept let y = 0 in the equation and solve for x

x + 0 = 9

x = 9 ← x- intercept ⇒ (9, 0 )

To find the y- intercept let x = 0 in the equation and solve for y

0 + y = 9

y = 9 ← y- intercept ⇒ (0, 9 )

Answer:

48pi or about 150.8 cm^3

Step-by-step explanation:

volume of cone = 1/3 * pi * r^2 * h

r = 12/2 = 6

1/3 (6^2) (4) pi = 48pi

48pi ~= 150.8 cm^3

Answer: 150.8 cm^3

Step-by-step explanation: The volume formula is V=πr^2(h/3). Once you plug in the radius (half the diameter) and the height, you solve the equation and get the answer of 150.8 cm^3

Answer:

975 girls

Step-by-step explanation:

To find 65% of 1500, multiply 1500 by .65 (to convert percentages to decimals, just move a decimal point over two spaces).

1500*.65=975

You can check that this answer is right with logic. Most of the students will be girls (more than 50%) and 975 makes up most of 1500.

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Answer:

Range = {-2, 1, 4, 13}

Step-by-step explanation:

Domain is the set of x-values that are allowed for the function. The values for which the function is defined.

Range is the set of y-values that are allowed for the fucntion. The values for which the function is defined.

Since domain is given as:

Domain = {-1, 0, 1, 4}

We have to plug in each of the 4 values and find the corresponding 4 values for the range. Lets do this below:

y = 3x + 1

y = 3(-1) + 1

y = -2

y = 3x + 1

y = 3(0) + 1

y = 1

y = 3x + 1

y = 3(1) + 1

y = 4

y = 3x + 1

y = 3(4) + 1

y = 13

So, the range would be:

Range = {-2, 1, 4, 13}

Answer:

1. HL

2. SAS

3. SSS

Step-by-step explanation:

Triangles ABR and ACR share side AR (hypotenuse of two right triiangles).

Angles ABR and ACR are right angles.

Sides AB and AC are congruent.

Sides BR and CR are congruent.

1. You can use HL theorem, because two triangles have congruent pair of legs and congruent hypotenuses.

2. You can use SAS theorem, because two triangles have two pairs of congruent legs and a pair of included right angles between these legs.

3. You can use SSS theorem, because two triangles have two pairs of congruent legs and  congruent hypotenuses.

Answer

1. HL

2. SAS

3. SSS

Step-by-step explanation:

just took the test aced it

Answer:

a. 10x + 2y = 23

b. 4x - y + 3 = 0

c. y + 8 = 0

d. 2x - y + 4 = 0

Step-by-step explanation:

a.

Slope of the line 'm' is [tex]\frac{36.5-1.5}{-5-2}[/tex] = [tex]\frac{35}{-7}[/tex] = -5

Equation of the line with slope m and passing through the point (x₁,y₁) is y-y₁ = m·(x-x₁)

⇒y-1.5 = -5·(x-2)

⇒y = -5x + 10 + 1.5

⇒5x + y = 11.5 (or) 10x + 2y = 23

b.

Slope of the line 'm' = 4

Equation of the line with slope m and passing through the point (x₁,y₁) is y-y₁ = m·(x-x₁)

⇒y-15 = 4·(x-3)

⇒y = 4x -12 + 15

⇒4x - y + 3 = 0

c.

Line is parallel to y = 1

Equations of parallel lines only differ by constant. So the required line equation has the form y = c where c is any real number.

But, it is given that the line passes through the point (3,-8)

⇒c=-8

⇒y = -8 (or) y + 8 = 0

d.

Equation of a line with slope 'm' and y-intercept of (0,c) is of the form y = mx + c

⇒y = 2x + 4

⇒2x - y + 4 = 0

The inequality which shows the number of weeks, w, you need to save to be able to go on a trip is 25w + 200 ≥ 535.

Linear inequalities are defined as those expressions which are connected by inequality signs like >, <, ≤, ≥ and ≠ and the value of the exponent of the variable is 1.

Total amount needed to go for a trip to California = $535

Already saved amount = $200

You decide to save an additional $25 per week.

Let w be the number of weeks needed to save $25 to get the amount needed to go for trip.

These saved amounts must be at least $535 to go for trip.

The amount saved after w weeks is 25w

Total saved amount = 200 + 25w

This saved amount must be ≥ 535.

So the inequality is 200 + 25w ≥ 535.

Hence the inequality which represents the amount need to save to go for trip is  200 + 25w ≥ 535.

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New equations for a system can be written by interacting (adding or subtracting) the given equations, using substitution to insert an equation into another, or scaling an equation by multiplying it by a constant.

When working with a system of equations, there are multiple ways in which we can write new equations that create equivalent systems. Here are three methods:

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Final answer:

To create equivalent systems of equations, one can use scaling to multiply an equation by a non-zero constant, substitution to replace variables with equivalent expressions, or elimination through addition or subtraction to reduce the number of variables.

Explanation:

When dealing with a system of equations, there are several methods to create equivalent systems, which effectively means rewriting the equations without changing the solution set. One common approach to achieve this is by using the following techniques:

Scaling: Multiplying an entire equation by a non-zero constant. This changes the coefficients but not the solutions.

Substitution: Replacing one variable with an equivalent expression derived from another equation in the system.

Elimination (Addition or Subtraction): Adding or subtracting equations from each other to eliminate one of the variables, effectively reducing the number of variables to solve for.

These methods allow us to simplify complex systems or prepare them for other solving techniques, such as matrix inversion or graphical representation.

Answer:

[tex]p (x) = x^{3} - 21x^{2}+ 147x - 343[/tex]

is the required polynomial with degree 3 and p ( 7 ) = 0

Step-by-step explanation:

Given:

p ( 7 ) = 0

To Find:

p ( x ) = ?

Solution:

Given p ( 7 ) = 0 that means substituting 7 in the polynomial function will get the value of the polynomial as 0.

Therefore zero's of the polynomial is seven i.e 7

Degree : Highest raise to power in the polynomial is the degree of the polynomial

We have the identity,

[tex](a -b)^{3} = a^{3}-3a^{2}b +3ab^{2} - b^{3}[/tex]

Take a = x

        b = 7

Substitute in the identity we get

[tex](x -7)^{3} = x^{3}-3x^{2}(7) +3x(7)^{2} - 7^{3}\\(x -7)^{3} = x^{3}-21x^{2} +147x - 343[/tex]

Which is the required Polynomial function in degree 3 and if we substitute 7 in the polynomial function will get the value of the polynomial function zero.

p ( 7 ) = 7³ - 21×7² + 147×7 - 7³

p ( 7 ) = 0

[tex]p (x) = x^{3} - 21x^{2}+ 147x - 343[/tex]

A polynomial function with degree 3 and P(7)=0 can be written as p(x) = a(x - 7)(x - r2)(x - r3), where r2 and r3 can be any real number and a is any non-zero real number.

The student has asked for a polynomial function with a degree of 3 such that P(7) equals 0. By definition, a polynomial function of degree n with given roots can be written as:

p(x) = a(x - r1)(x - r2)... (x - rn)

Since we have been given that P(7)=0 , we can choose 7 as one root, but the other roots can be chosen arbitrarily. So, we can create a polynomial function like below:

p(x) = a(x - 7)(x - r2)(x - r3)

Where r2 and r3 can be any real number and a is any non-zero real number. For example, if we choose r2=1, r3=2 and a=1. The function would be:

p(x) = 1*(x - 7)(x - 1)(x - 2) = ([tex]x^3 - 10x^2[/tex] + 29x - 14)

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1. r closest to 1: figure

2. No linear relationship: Figure 1

3. r equal to 1: Figure 3

Step-by-step explanation:

Correlation is the link between two variables or things"

Now for the scatter plot of a correlation:

Correlation coefficient closest to 1:

We can see in figure 4 that the data points are gathered across a line but not a perfect line and both the quantities are increasing so the correlation coefficient is close to 1.

Least Evidence of linear relationship:

Figure 1 can be observed to conclude that the data points are scattered on whole scatter plot hence creating no relationship

Correlation coefficient equal to -1:

We can see in figure 3 that one quantity is increasing and the other is decreasing and the data points are forming a line so the correlation coefficient will be -1

Keywords: Correlation, Scatter plot

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Answer: this equation has no solutions ,I just got it correct

Step-by-step explanation:

Answer:

No solutions

Step-by-step explanation:

Khan Academy says its right

The value of a and b in given expression must be [tex]\frac{2}{5} \text { and } \frac{3}{5}[/tex] respectively so that given equality becomes identity.

Need to find the value of a and b in following expression so that following equality will become identity.

[tex]\frac{(x-1)}{(x+1)(x-4)}=\frac{a}{(x+1)}+\frac{b}{(x-4)}[/tex]   ------- eqn 1

Lets Simplify Right hand Side first,

[tex]\frac{a}{(x+1)}+\frac{b}{(x-4)}=\frac{a(x-4)+b(x+1)}{(x+1)(x-4)}[/tex]

[tex]\begin{array}{l}{=\frac{a x-4 a+b x+b}{(x+1)(x-4)}} \\\\ {=\frac{a x+b x-4 a+b}{(x+1)(x-4)}} \\\\ {=\frac{(a+b) x-4 a+b}{(x+1)(x-4)}}\end{array}[/tex]

[tex]=>\frac{a}{(x+1)}+\frac{b}{(x-4)}=\frac{(a+b) x-4 a+b}{(x+1)(x-4)}[/tex]

[tex]\text {On substituting } \frac{a}{(x+1)}+\frac{b}{(x-4)}=\frac{(a+b) x-4 a+b}{(x+1)(x-4)} \text { in equation } 1 \text { we get }[/tex]

[tex]\frac{(x-1)}{(x+1)(x-4)}=\frac{(a+b) x-4 a+b}{(x+1)(x-4)}[/tex]

On multiplying both sides by (x+1)(x-4) we get

[tex]\frac{(x-1)}{(x+1)(x-4)} \times(x+1)(x-4)=\frac{(a+b) x-4 a+b}{(x+1)(x-4)} \times(x+1)(x-4)[/tex]

[tex]\Rightarrow x-1=(a+b) x-(4 a-b)[/tex]

On comparing coefficient of x and constant term separately, we get

a + b = 1 and 4a - b = 1

On adding the two equations we get

a + b + 4a - b = 1 + 1

=> 5a = 2

=> [tex]a = \frac{2}{5}[/tex]

[tex]\text {Substituting } \mathrm{a}=\frac{2}{5} \text { in equation } a+b=1, \text { we get }[/tex]

[tex]\begin{array}{l}{\frac{2}{5}+b=1} \\\\ {\Rightarrow b=1-\frac{2}{5}=\frac{3}{5}}\end{array}[/tex]

So the value of a and b in given expression must be [tex]\frac{2}{5} \text { and } \frac{3}{5}[/tex] so that given equality becomes identity.