verify that sin2x=2cotsin^2x is an identity

Answer:

z = 7.5

Step-by-step explanation:

Given that z is directly proportional to x and inversely proportional to y then the equation relating them is

z = [tex]\frac{kx}{y}[/tex] ← k is the constant of proportionality

To find k use the condition when x = 16, y = 5, z = 16, then

k = [tex]\frac{zy}{x}[/tex] = [tex]\frac{16(5)}{16}[/tex] = 5

z = [tex]\frac{5x}{y}[/tex] ← equation of proportionality

When x = 21, y = 14, then

z = [tex]\frac{5(21)}{14}[/tex] = 7.5

Answer:

The maximum number of turkey sandwiches Ben could have sold is 6.

Step-by-step explanation:

We are given that turkey sandwiches cost $2.50 and veggie wraps cost $3.50 at a snack stand.

Given the information, we are to find the maximum value of turkey sandwiches Ben could have sold.

[tex] 2 . 5 0 x + 3 . 5 0 y \leq 3 0 [/tex]

Number of veggie wraps sold (y) = 4

2.50x + 3.50(4) <   30

2.50x + 14          <   30

          - 14               -14

2.50x                   <   16

[tex]x<\frac{16}{2.50}[/tex]

[tex]x <6.4[/tex]

The maximum number of turkey sandwiches Ben could have sold is 6.

The maximum value of turkey sandwiches Ben could have sold is;

Option B; 6

Let number of turkey sandwiches be x

Let number of veggie wraps be y.

We are told that Turkey sandwiches cost $2.50 and veggie wraps cost $3.50.

Thus, for x number of Turkey sandwiches, the cost will be; 2.5x

For y number of veggie wraps, the cost will be 3.5y.

         We are told he sold no more than $30 worth of turkey sandwiches and veggie wraps in the first hour of business. Thus, inequality to represent this scenario is;

2.5x + 3.5y ≤ 30

Now, he has sold 4 veggie wraps. Thus;

2.5x + 3.5(4) ≤ 30

2.5x + 14 ≤ 30

2.5x ≤ 30 - 14

2.5x ≤ 16

x ≤ 16/2.5

x ≤ 6.4

Since the number can't be decimal, we approximate to a whole number to get; x = 6

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[tex]\bf \textit{volume of a sphere}\\\\ V=\cfrac{4\pi r^3}{3}~~ \begin{cases} r=radius\\ \cline{1-1} V=1349 \end{cases}\implies 1349=\cfrac{4\pi r^3}{3}\implies 4047=4\pi r^3 \\\\\\ \cfrac{4047}{4\pi }=r^3\implies \sqrt[3]{\cfrac{4047}{4\pi }}=r\implies 6.85\approx r[/tex]

Answer:

D

Step-by-step explanation:

solve square root of 3x plus 1 = 4:

D is correct and results in 3x + 1 = 16; after this we subtract 1 from both sides and end up with 3x = 15, or x = 5.

Answer:

To solve this equation we have to first remove the square root from LHS and to remove the square we have to square both sides.

Step-by-step explanation:

The quadratic equation which violet has to solve is given as

[tex]\sqrt{3x+1}=4[/tex]................(1)

Step 1

To solve this equation we have to first remove the square root from LHS and to remove the square we have to square both sides.

After squaring both the sides we got following equation

[tex]3x+1=16[/tex]....(2)

Step 2

now subtract 1 from both sides to remove 1 from LHS

so we will get the following equation

[tex]3x=15[/tex]....(3)

Step 3

Now divide by 3 from both sides to remove 3 from LHS

Therefore,

[tex]x=\frac{15}{3}[/tex]

[tex]x=5[/tex]

Answer: 5

Step-by-step explanation: First, add all of the given numbers.

5+7+4+4+5+4+6=35

Next, divide 35 by the number of given numbers, which is 7.

35/7 = 5

The mean is 5.

Answer:

CE = 16

Step-by-step explanation:

From my understanding, the length of cord AB is given. According to the question in the picture attached, you need to find CE.

Triangle ABD and triangle ACE are similar.

Therefore, AB/AC = BD/CE

AB = 6, AC = 8, BD = 12, CE = ?

6/8 = 12/CE

CE = 12x8/6

CE = 16

Therefore, CE is equal to 16.

!!

you can do it ans is above

Answer:

It increases by 2 degrees every day

Step-by-step explanation:

51-47=4 4/2 equal 2

Answer:

46^6 x 59^6

Step-by-step explanation:

For properties (axb)^y has the equivalent expression of a^y x b^y

Then, (46x59)^6 can be written as 46^6  x 59^6

Answer: [tex]46^6* 59^6[/tex]

Step-by-step explanation:

Given the expression [tex](46* 59)^6[/tex], in order to find an equivalent expression using the same bases, you need to remember the following:

[tex](a*b)^n=a^n*b^n[/tex]

So, you can observe that, in this case:

[tex]a=46\\b=59\\n=6[/tex]

Therefore, substituting values, you get the following equivalent expression:

[tex](46* 59)^6=46^6* 59^6[/tex]

Answer:

B

Step-by-step explanation:

recall that point-slope form of a linear equation is expressed as follows

y - y1 = m (x - x1)

where m = slope and (x1, y1) is the coordinate of any point on the line

so, here we have m = (3/5), x1 = 4 and y1 = -6

substitute these into the formula

y - (-6) = (3/5) (x - 4)

y + 6 = (3/5) (x - 4)----> answer

Answer:

[tex]\boxed{\text{B. }y + 6 =\dfrac{3}{5}(x - 4)}[/tex]

Step-by-step explanation:

The point-slope formula for a straight line is

[tex]y - y_{1} = m(x - x_{1})[/tex]

x₁ = 4; y₁ = -6; m = ⅗  

Substitute the values

[tex]\begin{array}{rcl}y - (-6) & = & \dfrac{3}{5}(x - 4)\\\\y + 6 & = & \dfrac{3}{5}(x - 4)\\\\\end{array}\\\text{The equation for the line is $\boxed{\mathbf{y + 6 =\dfrac{3}{5}(x - 4)}}$}[/tex]

The figure shows the graph of the equation with slope ⅗ passing through (4,-6).

Answer:

a) Option A is correct.

b) Option C is correct.

Step-by-step explanation:

a) Which of the following is the equation of  the line passing through the points (1, 1)  and (-3,5)?

We will use the equation

(y-y₁)=m(x-x₁)

m= (y₂-y₁)/(x₂-x₁)

m= (5-1)/(-3-1)

m= 4/-4

m= -1

Consider point (1,1) and Putting value of m

(y-y₁)=m(x-x₁)

(y-1)=1(x-1)

y-1=x-1

y=x-1+1

y=x

So, Option A is correct.

b) Which of the following is the equation of a  line with a slope of 0 passing through (2,5)?

The formula used is:

y= mx+b

Finding b:

5=0(2)+b

=> b = 5

So, equation is:

y = mx+b

y=0x+5

y=5

So, Option C is correct.

Answer:

35/3 ft = 11 2/3 ft

Step-by-step explanation:

We make a table of the lengths of the sides in descending order of side length. Each line contains two corresponding sides.

              Quadrilateral           Quadrilateral

              ABCD                       EFGH

Side 1      20 ft                         ?

Side 2     18 ft                          ?

Side 3     14 ft                           6 ft

Side 4       ?                              5 ft

The line corresponding to side 3 is the only line that has the lengths of both corresponding sides.

The ratio of the length of sides in ABCD to EFGH is 14/6 = 7/3.

To find the length of the 4th sides of ABCD, we multiply the length of the 4th side of EFGH by the ratio.

7/3 * 5 ft = 35/3 ft = 11 2/3 ft

Answer:

d. The slope is −0.3. Starting at 3.9, the GPA will decrease by 0.3 for every text sent in class.​

Step-by-step explanation:

You can write the equation is the slope intercept form of y=mx+c

where m is the slope and c in the y-axis intercept

write the equation as;

y=mx+c

y= -0.3x+3.9

Here , you have a negative slope which means the GPA will reduce by 0.3 for every text sent in class.

See attached graph to visualize the y-intercept point

Answer:

The correct option is d.

Step-by-step explanation:

The given equation of best fit line is

[tex]y=3.9-0.3x[/tex]              .... (1)

The slope intercept form of a line is

[tex]y=mx+b[/tex]               .... (2)

where, m is slope and b is y-intercept or initial value.

From (1) and (2), we get

[tex]m=-0.3[/tex]

[tex]b=3.9[/tex]

It means the slope is −0.3. Starting at 3.9, the GPA will decrease by 0.3 for every text sent in class.​

Therefore the correct option is d.

Answer:

B

Step-by-step explanation:

Point slope equation is y-y₁=m(x-x₁)  so as long as the x or y is not negative you have to subtract the number hence y-2=-5/7(x-6)

Answer:

B

Step-by-step explanation:

just did it

Answer:

(y-1)^2=20(x-3)

Step-by-step explanation:

The parabola is sideways so the squared part will be on the y.

The equation will be using is (y-k)^2=4p(x-h)

where (h,k) is the vertex.

p tells us which way the parabola opens by the sign.

p also tells us how far the directrix is from the vertex or the vertex from the focus.

Anyways if you graph the vertex and the directrix you will see the parabola opens to the right so p is going to be positive.

Now since the directrix is at x=-2 and the vertex is at (3,1) then p=3-(-2)=5.  5 means that the directrix and vertex are 5 units apart.

The vertex was given as (3,1) so h=3 and k=1.

Let's plug this information in:

(y-1)^2=4*5(x-3)

Let's simplify just a little.

(y-1)^2=20(x-3)

Answer:

C

Step-by-step explanation:

on edge

Answer:

[tex]\large\boxed{7(3x-2)+4(x+5)=25x+6}[/tex]

Step-by-step explanation:

[tex]7(3x-2)+4(x+5)\qquad\text{use the distributive property}\ a(b+c)=ab+ac\\\\=(7)(3x)+(7)(-2)+(4)(x)+(4)(5)\\\\=21x-14+4x+20\qquad\text{combine like terms}\\\\=(21x+4x)+(-14+20)\\\\=25x+6[/tex]

Answer:

[tex]\Huge \boxed{25x+6}[/tex]

Step-by-step explanation:

[tex]\large \textnormal{Distributive property}[/tex], [tex]\large \textnormal{A(B+C)=AB+AC}[/tex].

[tex]\displaystyle 7(3x-2)=21x-14[/tex]

[tex]\displaystyle 21x-14+4(x+5)[/tex]

[tex]\displaystyle 4(x+5)=4x,5\times 4=20, 4x+20[/tex]

[tex]\Large\textnormal{Solve to find the answer.}[/tex]

[tex]\displaystyle 21x-14+4x+20=25x+6[/tex]

[tex]\Large \textnormal{Correct answer is \boxed{25x+6}.}[/tex]

Answer:

-3

Step-by-step explanation:

To find the slope of a line given two points, we use:

[tex]\frac{y_2-y_1}{x_2-x_1} \text{ when the points } (x_1,y_1) \text{ and } (x_2,y_2) \text{ are on the line }[/tex].

Or you could line up the points vertically and subtract the points vertically, then put 2nd difference over 1st difference.

That looks like this:

(  2  ,  -12)

-( -5  ,  9   )

----------------

  7         -21

So the slope is -21/7 which gives you -3.

Answer:

Percent error: 6.00%

Step-by-step explanation:

We find the mean of the three masses

Mean = 1.20 + 0.91 + 1.08 / 3

Mean = 1.06 kg

The experimental value of mass is = 1.06 kg

The actual value of mass = 1 kg

The percent error is: (experimental value - actual value/actual value)*100

Percent error : (1.06 - 1 / 1)*100

Percent error: 6.00%

Answer:

6.33

Step-by-step explanation:

1. Find the average:

1.20+0.91+1.08 = 3.19

3.19/3 = 1.06333... (aka the Average)

2. Subtract the average by the True mass:

1.06333... - 1 (the True Mass) = 0.06333...

3. Divide answer by the True mass:

[Because when you divide it by the True Mass it's still 0.06333...]

4. Multiply by 100 (to get the percentage)

0.06333 * 100 = 6.333...

5. In result 6.33% is the correct answer.

Putting two or more equations in a system means to find the set of variables that satisfies all the equations at the same time.

Moreover, the points that satisfy an equation are the points that lay on the graph described by the equation.

So, putting everything together, solving a system means to lay on all the graphs at the same time. In other words, the solutions of a system are the points of intersection between the graphs that represent the functions involved in the system.

In this case, the line and the circumference have two points of intersection, and they are the two solutions of the system.

In the absence of the graph, one can still note that the number of solutions a nonlinear system of equations has depends on the points of intersection of the curves represented by the equations. Each point of intersection represents a solution.

Unfortunately, without the graph, it is rather difficult to directly answer how many solutions the nonlinear system of equations has. In general, the number of solutions for a nonlinear system of equations can be determined by where the curves represented by the equations intersect. The point of intersection is considered a solution. This is because at this point both equations hold true. If the curves intersect once, then there is one solution. If they intersect twice, then there are two solutions. If they never intersect, there are zero solutions.

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Answer: 2.72 hours

Step-by-step explanation:

Let's call [tex]t_1[/tex] while it takes Wade to paint the room

Let's call [tex]t_2[/tex] while it takes Rhonda to paint the same room.

Then we know that:

[tex]t_1 = 5\ hours\\t_2 = 6\ hours[/tex].

Let's call it t as it takes Rhonda and Wade to paint the same room working together.

Now we use the following formula to calculate t.

[tex]\frac{1}{t}=\frac{1}{t_1}+\frac{1}{t_2}[/tex]

[tex]\frac{1}{t}=\frac{1}{5}+\frac{1}{6}[/tex]

[tex]\frac{1}{t}=\frac{11}{30}[/tex]

[tex]t=\frac{30}{11}[/tex]

[tex]t=2.72\ hours[/tex]

If they work together they will be able to paint the room in 2.72 hours

Answer: 2.73 hours

Step-by-step explanation:

Answer:

[tex]\large\boxed{x\leq0}[/tex]

Step-by-step explanation:

x ≤ 0 - the region below the line x = 0 (x axis)

x ≥ 0 - the region above the line x = 0 (x axis)

y ≤ 0 - the region on the left of the line y = 0 (y axis)

y ≥ 0 - the region on the right side of the line y = 0 (y axis)

all region with lines (axes)

We have the region below the x axis (x = 0).

Answer:

2

Step-by-step explanation:

1/4+1/4=1/2

Answer:

the answer is 0.5 lol

Answer:

Similar but not congruent

Step-by-step explanation:

For them to be congruent, they have to have same everything but not necessarily the same orientation.  They are not congruent because their corresponding sides aren't the same measurement.

You can tell if two triangles are similar if each pair of corresponding are congruent.

They will also have corresponding sides are proportional.

That is 50/40=60/48=40/32 in this case? Well does it?  It does, because each one of them is equal to 1.25.

Answer:

The correct answer is second option

They are similar, but not congruent

Step-by-step explanation:

From the given diagram we can see two triangles.

ΔUVW and ΔXYZ

m<X = m<U,

m<Y = m<V and

m<Z = m<W

Therefore two triangles are similar

The sides of these two triangles are not congruent, therefore these two triangles are not congruent.

The correct answer is second option

They are similar, but not congruent

Answer:

The answer is A - symmetry.

None of the other options really have bearing in relation to the question.

Hope this helps.

Step-by-step explanation:

The given image shows the symmetry of a shape. Both the divided sides are equal halves of the shape. Therefore, option C, symmetry is correct option.

Symmetry is a property of a figure that describes how it looks the same after being transformed in a certain way. In other words, a figure is said to have symmetry if it can be divided into parts that are mirror images or identical to each other.

There are different types of symmetry, such as :reflection symmetry, rotational symmetry, translational symmetry etc.

Symmetry is an important concept in many areas of mathematics and science, such as geometry, crystallography, physics, and chemistry. It is also a fundamental aspect of beauty and aesthetics in art, architecture, and design.

The given figure can be divided into two equal halves. Hence, the two sides are in symmetry. Thus, option C is correct.

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Your complete question is attached below:

Answer:

15 hours.

Step-by-step explanation:

Suppose the time taken to catch Mike is t hours and the distance ran by Mike   is x miles then

5.5 = x/ t     (Mike)     --- ...(1)

6 = (x +7.5 )/ t (Julia ).......(2)

From equation (1):

x = 5.5t  ..............(3).

From equation (2):

x + 7.5 = 6t

x = 6t - 7.5............(4).

Eliminating x from equations 3 and 4:

6t - 7.5 = 5.5t

0.5t = 7.5

t = 15 hours.

k/2+1/2=3

Move +1/2 to the other side. Sign changes from +1/2 to -1/2

k/2+1/2-1/2=3-1/2

k/2=3-1/2

Find the common denominator for 3 and -1/2.

Common denominator is 2

k/2=3(2)-1/2

k/2= 6/2-1/2

k/2=5/2

Multiply k/2 with 2. Multiply 2 with 5/2

k/2 (2/1)=2(5/2)

Cross out 2 and 2. Divide by 2. Cross out 2 and 2 for 5/2(2). Divide by 2

k=5