please help and explain the answer!

Answer:

there are solutions for all values of k

Step-by-step explanation:

In order for there to be no real solutions, the value of the discriminant must be negative. For this equation, the discriminant is ...

(-(k+2))^2 -4(3)(k-1)

We want to find values of k for which this is negative:

(k^2 +4k +4) -12k +12 < 0

k^2 -8k +16 < 0

(k -4)^2 < 0

A square is never negative, so there are no values of k that result in the equation having no solutions.

Answer:

(0,170)  and (60,-70) and (5, 150)

Step-by-step explanation:

To see if a given point is on the line or not, you just have to enter the x value (first value in the parenthesis) and see if the function returns the correct y value (second number in the parenthesis).

f(x) = -4x + 170

(170,0)  => -4 (170) + 170 = -680 + 170 = 510.  NO, not equal to 0.

(0,170) =>  -4 (0) + 170 = 0 + 170 = 170. YES

(12, 126)  => -4 (12) + 170= -48 + 170= 122. No, not equal to 126.

(50,30)  => -4(50) + 170 = -200 + 170 = 130. No, not equal to 30.

(5, 150)  => -4(5) + 170 = -20 + 170 = 150. YES

(60,-70) => -4(60) + 170 = -240 + 170 = -70.  YES

Answer:

(0,170)  and (60,-70) and (5, 150)

Step-by-step explanation:

Answer:

14 m^2

Step-by-step explanation:

The method used to find the area of this trapezoid is to put the given numbers into the formula for the area of a trapezoid. That formula is ...

A = (1/2)(b1 +b2)h

where b1 and b2 are the lengths of the parallel bases, and h is the perpendicular distance between them.

The figure shows you that b1 and b2 are 5 m and 2 m (in no particular order) and h is 4 m. Putting these numbers into the formula gives ...

A = (1/2)(5 m + 2m)(4 m) = (1/2)(28 m^2) = 14 m^2

Answer:

v(w) = 7w³

Step-by-step explanation:

The formula for the volume of a cuboid (rectangular prism, or box) is ...

V = LWH . . . . . . where L represent length, W represents width, and H represents height

The problem statement tells you that for a box of width w (in inches), the length is 2w, and the height is 3.5w. Using these values in the formula, we have ...

V = (2w)(w)(3.5w)

V = 7w³

Written as a function v(w), volume as a function of width, this is ...

v(w) = 7w³

For this case we have that the equation of a straight line in the form of an intersection is given by:

[tex]y = mx + b[/tex]

Where:

m: It's the slope

b: It is the cutoff point with the y axis

We found the slope:

[tex]m = \frac {y2-y1} {x2-x1} = \frac {8-6} {4-5} = \frac {2} {- 1} = - 2[/tex]

So, the line is:

[tex]y = -2x + b[/tex]

We find the cut point by substituting a point:

[tex]8 = -2 (4) + b\\8 = -8 + b\\b = 8 + 8\\b = 16[/tex]

Finally, the equation is:

[tex]y = -2x + 16[/tex]

We can also have the equation of the point-slope form:

[tex]y-y_ {0} = m (x-x_ {0})[/tex]

Where:

[tex](x_ {0}, y_ {0}) = (4,8)[/tex]represents a point:

So:

[tex]y-8 = -2 (x-4)[/tex]

ANswer:

[tex]y-8 = -2 (x-4)\\y = -2x + 16[/tex]

Answer:

  $5.82

Step-by-step explanation:

A markup or markdown of p% on a price causes that price to be multiplied by ...

  (1 + p/100)

The price after the markup 115% is ...

  $7.74(1 + 115/100)

And the price after that has been marked down 65% is ...

  $7.74(1 +115/100)(1 -65/100) = $7.74×2.15×0.35 ≈ $5.82

The discount price was $5.82.

[tex]\bf \begin{cases} 5x-4y=16\\ \cline{1-1} x-2y=6\\ \boxed{x}=6+2y \end{cases}~\hspace{7em}\stackrel{\textit{substituting \underline{x} in the first equation}}{5\left( \boxed{6+2y} \right)-4y=16} \\\\\\ 30+10y-4y=16\implies 30+6y=16\implies 6y=-14 \\\\\\ y=-\cfrac{14}{6}\implies y=-\cfrac{7}{3}\implies \blacktriangleright y=-2\frac{1}{3} \blacktriangleleft \\\\[-0.35em] ~\dotfill[/tex]

[tex]\bf \stackrel{\textit{since we know that}}{x=6+2y}\implies x=6+2\left( -\cfrac{7}{3} \right)\implies x=6+\left(-\cfrac{14}{3} \right) \\\\\\ x=6-\cfrac{14}{3}\implies x=\cfrac{18-14}{3}\implies x=\cfrac{4}{3}\implies \blacktriangleright x=1\frac{1}{3} \blacktriangleleft \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill \left( 1\frac{1}{3} ~,~-2\frac{1}{3}\right)~\hfill[/tex]

Answer:

  (x, y) ⇒ (-y, x)

Step-by-step explanation:

You can see that the points (1, 2) and (3, 5) get mapped to (-2, 1) and (-5, 3), respectively. That is, the old value y, when negated, is the new value of x; and the old value of x is the new value of y.

___

I find it easier to think of a 270° CW rotation as being the same as a 90° CCW rotation.

[tex]\bf \begin{bmatrix} 11&-8\\-1&12 \end{bmatrix}\implies \stackrel{Determinant}{(11\cdot 12)-(-1\cdot -8)}\implies 132-(8)\implies 124[/tex]

recall, minus * minus = plus.

Answer:

See image and explanation

Step-by-step explanation:

Point (-7,-2) is the center of dilation. The scale factor is 2.

If point A has coordinates (-3,-2), then its image point H has coordinates (1,-2).

If point B has coordinates (-6,2), then its image point E has coordinates (-5,6).

If point C has coordinates (-4,3), then its image point F has coordinates (-1,8).

If point D has coordinates (-1,1), then its image point G has coordinates (5,4).

Answer:

hope this helps :)

Step-by-step explanation:

I think these two are the right answer.

Answer:

$27

Step-by-step explanation:

If the table was marked up 125%, you can find the retail price of it this way:

20 + 1.25(20) = retail price

$45 = retail price.

To find 40% off of that, use

$45 - .4($45) = sale price

$27 = sale price (aka discount price)

Answer:

• n(t) = 150·2^t . . . . . . . . . . . . number of cells after t minutes

• a(t) = π(0.25 +0.50t)^2 . . . . area in cm^2 after t minutes

• d(t) = n(t)/a(t) = (2400·2^t)/(π(1+2t)^2)

Step-by-step explanation:

The number of cells (n(t)) is described by an exponential function of time (t) with an initial value of 150 and a growth factor of 2 each minute:

n(t) = 150·2^t . . . . . . n in cells; t in minutes

___

The area of the culture is given by ...

a(t) = π·(r(t))^2 . . . . where r(t) is the radius as a function of time.

The radius is linearly increasing with a rate of increase of 0.50 cm/min, so can be described by ...

r(t) = 0.25 +0.50t

Then the area is ...

a(t) = π·(0.25 +0.50t)^2

A factor of 0.25 can be removed from inside parentheses to make this be ...

a(t) = (π/16)(1 +2t)^2 . . . . . a in cm^2; t in minutes

___

The density is the number of cells divided by the area:

d(t) = n(t) / a(t) = 150·2^t/((π/16)(1 +2t)^2)

Simplifying a bit, this is ...

d(t) = (2400/π)(2^t)/(1 +2t)^2 . . . . . d in cells/cm^2; t in minutes

Answer:

12 ft-lbs is your answer

12ft-lbs that she has done

Trish ate her yummy breakfast at 7:30 :)

Answer:

7:30 am

Step-by-step explanation:

Subtract 90 minutes from 9:00 am to determine what time Trish ate breakfast.

Answer:

Part a) Each friend will receive [tex]\frac{3}{10}\ pounds[/tex]

Part b) [tex]\frac{19}{20}\ pounds[/tex]  or [tex]0.95\ pounds[/tex]

Step-by-step explanation:

Part a)

we know that

To calculate the weight of peanuts in pounds that each friend will

receive, divide the total pounds of peanuts by two

so

[tex]\frac{(3/5)}{2}=\frac{3}{10}\ pounds[/tex]

Part b)

Let

x-----> pounds of extra peanuts the friend needs to end up with 2 pounds of peanuts

we know that

[tex]2=x+\frac{3}{10}+\frac{3}{4}[/tex]

Solve for x

[tex]x=2-(\frac{3}{10}+\frac{3}{4})[/tex]

Multiply by 40 both sides

[tex]40x=80-(12+30)[/tex]

[tex]40x=38[/tex]

[tex]x=\frac{38}{40}\ pounds[/tex]

Simplify

[tex]x=\frac{19}{20}\ pounds[/tex]  or [tex]x=0.95\ pounds[/tex]

Answer:

25

Step-by-step explanation:

[tex]\bf \qquad \qquad \qquad \textit{discriminant of a quadratic} \\\\\\ y=\stackrel{\stackrel{a}{\downarrow }}{a}x^2\stackrel{\stackrel{b}{\downarrow }}{+b}x\stackrel{\stackrel{c}{\downarrow }}{+c} ~~~~~~~~ \stackrel{discriminant}{b^2-4ac}= \begin{cases} 0&\textit{one solution}\\ positive&\textit{two solutions}\\ \stackrel{-16}{negative}&\textit{no solution}~~\checkmark \end{cases}[/tex]

Answer:

A quadratic equation of the form 0 = ax² + bx + c with a discriminant value of –16 has no real solution

Step-by-step explanation:

A quadratic equation ax²+bx+c=0 with discriminant D=b²-4ac has

2 unequal real solutions if D is positive i.e. D>0

2 equal real roots if D=0

no real root if D is negative i.e. D<0

Here, we are given value of D= -16 which is less than zero

Hence, a quadratic equation of the form 0 = ax² + bx + c with a discriminant value of –16 has no real solution

Answer:

f(x) = q • 1.025x + 5

Step-by-step explanation:

Mrs. Varner deposited q dollars in a bank account that has been earning annual interest.

The total value of the account is based on the function f(x) = q • 1.025x

where x represents the number of years the money has been in the account.

If no deposits or withdrawals are made after the initial deposit, the equation that represents the total value of the account 5 years from now is :

f(x) = q • 1.025x + 5

Answer:

b

Step-by-step explanation:

Answer:

Final answer is x=4, y=7.

Step-by-step explanation:

Questions says to use the graph to determine the number of solutions the system has. where system of equations are x=4 and y=x+3

any equation of the form x=k is a vertical line crossing x-axis at k.

So x=4 is a vertical line crossing x-axis at 4.

y=x+3 has slope m=1 and y-intercept b=3

So it passes through point (0,3) and for slope m=1, rise 1 up then 1 right to get new point.

Then final graph is given as shown in the picture.

We can see that both lines intersect at point (4,7).

Hence final answer is x=4, y=7.

Answer:

C. 4(x – 3)

Step-by-step explanation:

(6 x - 4) - (2 x + 8)

6 x - 4 - 2 x - 8

4 x - 12

Factor

4 ( x - 3 )

Answer: First option and Third option

Step-by-step explanation:

You can observe in the figure that the angle 1 and the angle 2 have a common vertex and a common side. These kind of angles are known as "adjacent angles".

You can observe that the intersection of the lines forms four equal anles wich are right angles (Angles of 90 degrees). Thererefore, the angles 1 and 2 and also "complementary angles", because the sum of them is 90 degrees.

Then, the answers are the first option and the third option.

Answer:

The area of the parallelogram is 108 inches² OR 0.75 foot²

Step-by-step explanation:

* Lets revise the properties of the parallelogram

- Each two opposite bases are are parallel

- Each two opposite bases are equal in length

- Each two opposite angles are equal in measure

- Each two adjacent angles are supplementary (their sum = 180°)

- Its two diagonals bisect each other

- Each base has an altitude (height) drawn from the opposite

 base to it

* Look to the attached figure to more understand

- The area of the parallelogram is the product of the length of one

 of its base and the corresponding altitude (height)

∵ Area = B1 × H1 ⇒ OR ⇒ Area = B2 × H2

∵ B1 = 1 1/2 feet

∵ H1 = 6 inches

- The base and the height have different units, so we must

 change the unit of one of them to the other

∵ 1 foot = 12 inches

∵ B1 = 1 1/2 = 1.5 feet

∴ B1 = 1.5 × 12 = 18 inches

∴ A = 18 × 6 = 108 inches²

* The area of the parallelogram is 108 inches²

OR

∵ B1 = 1 1/2 = 1.5 feet

∵ H1 = 6 inches

∴ H1 = 6 ÷ 12 = 1/2 = 0.5 foot

∴ A = 1.5 × 0.5 = 0.75 foot²

* The area of the parallelogram is 0.75 foot²

Answer:

108 square inches

Step-by-step explanation:

We know that the formula of area of a parallelogram is given by:

A = base × altitude

Since here we have different units for base and altitude, so either we will change the base to inches or the altitude to feet.

Base = [tex]1\frac{1}{2} ft = 1.5 ft[/tex]

[tex]\frac{1}{1.5ft} =\frac{12inches}{x}[/tex]

Base (x) = 18 inches

Substituting the values in the above formula to get:

Area of parallelogram = 18 × 6 = 108 square inches

Answer:

D

Step-by-step explanation:

You need to get the x out of the position in which is currently sitting, which is exponential.  The only way to get an exponent out from that position is to take the log of both sides.  The power rule of logs allows us to move the exponent down in front of the log.  Like this:

7x - 2 log (125)=log(150)

Now you want to divide both sides by log(125) to get the 7x - 2 all by itself:

[tex]7x-2=\frac{log(150)}{log(125)}[/tex]

Do that on your calculator and you'll get this:

7x - 2 = 1.037760918

Add 2 to both sides to get

7x = 3.037760918

then divide both sides by 7:

x = .4339 which rounds to .4340

Answer:

D.) -0.1375

Step-by-step explanation:

Answer:

Im pretty sure its 13 for Tracy and 26 for Simon

Answer:

I believe Simon is currently 24 and Tracy is 12

Step-by-step explanation:

24+12=36

12+12=24

you add 12 to each to see in 12 YEARS

Then you can see if it is 1.5 times as much by dividing by 1.5 or multiplying by 1.5

Like:

24*1.5=36

36/1.5=24

And that's how you do it

hope this halps :)

pls mark me brainliest as well

The divergence of the vector field [tex]\vec F[/tex] is

[tex]\nabla\cdot\vec F=y^2+0+x^2=x^2+y^2[/tex]

By the divergence theorem,

[tex]\displaystyle\iint_S\vec F\cdot\mathrm d\vec S=\iiint_V(x^2+y^2)\,\mathrm dV[/tex]

where [tex]V[/tex] denotes the region with boundary [tex]S[/tex]. Convert to cylindrical coordinates:

[tex]x=u\cos v[/tex]

[tex]y=u\sin v[/tex]

[tex]z=z[/tex]

The integral is then

[tex]\displaystyle\int_0^{2\pi}\int_0^2\int_{u^2}^4u^3\,\mathrm du\,\mathrm dv=\frac{32\pi}3[/tex]

Using the Divergence Theorem, the flux of the vector field F across the surface S can be calculated by finding the dot product of F and the outward-pointing unit normal vector to the surface. This concept is similar to that of a Gaussian surface in physics, which is used to analyze the flux of electric fields.

In this problem, you are required to use the Divergence Theorem in order to calculate a surface integral, specifically the flux of the vector field F across a defined surface S. At a basic level, the Divergence Theorem states that the flux of a vector field through a closed surface is equal to the triple integral of the divergence of the field over the volume enclosed by the surface.

In this specific scenario, we have the vector field F(x, y, z) = (cos(z) + xy²) i + xe⁻ᶻ j + (sin(y) + x²z) k, and the surface S is bounded by the paraboloid z = x² + y² and the plane z = 4. To calculate the surface integral, you would first express these surfaces parametrically and then find the outward pointing unit normal vector to the surface. The dot product of F and this normal vector will give the amount of F flowing across an infinitesimal element of the surface, which when integrated over the entire surface, yields the flux of F across S.

This process is similar to the concept of Gaussian surface, which is used to calculate the flux of an electric field. In both cases, we're examining how a field interacts with a defined space or volume.

https://brainly.com/question/31272239

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For this case we have a mixed number given by:

[tex]6 \frac {3} {4} = \frac {6 * 4 + 3 * 1} {4} = \frac {27} {4}[/tex]

We make a rule of three to get the miles that the car can travel.

36 ---------> 1

x ------------> [tex]\frac {27} {4}[/tex]

Where "x" represents the variable that gives the number of miles that the car can travel with [tex]\frac{27}{4}[/tex]gallons of gasoline

[tex]x = \frac {\frac {27} {4} * 36} {1}\\x = 243[/tex]

So, the car can travel 243 miles

ANswer:

243 miles

Answer:

B, C

Step-by-step explanation:

The values of the expressions are ...

A:

20^2 -18^2 = (20 -18)(20 +18) = 2·38 = 4·19 ≠ 12^2 = 4·36

__

B:

8(4^2) +2^4 = 8(4^2) +4^2 = (8+1)·4^2 = (3·4)^2 = 12^2

__

C:

15^2 -3^4 = 15^2 -9^2 = (15 -9)(15 +9) = 6·24 = 6·2·12 = 12^2

Answer:

66

6 x 10=60

6 x 1=6

60+6=66

Have a good day!!! <3 Hope this helped ma dude :)

Answer:

1. MN≅QP

  MQ≅NP

2. MP≅MP

3. SSS congruence postulate

4. ∠N≅∠Q

5. CPCTC

Step-by-step explanation:

1. As per the property of parallelogram that opposite sides are congruent, in given case of parallelogram MNPQ the opposite sides

                    MN≅QP  and   MQ≅NP.

2. The reflexive property of congruence states that a line or a geometrical figure is reflection of itself and is congruent to itself. Hence in given case of parallelogram MNPQ

                                         MP≅MP

3. SSS congruence postulate stands for Side-Side-Side congruence postulate, it states that when three adjacent sides of two triangle are congruent then the two triangles are congruent. In given case of parallelogram MNPQ, as the sides MN≅Q, MQ≅NP and MP≅MP hence

                               ΔMQP≅ΔPNM

5. As proven in part 4 that ΔMQP is congruent to ΔPNM, so as per the property of CPCTC (congruent parts of congruent triangles are congruent)

                                 ∠N≅∠Q

5. CPCTC stands for congruent parts of congruent triangles are congruent.

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