What is the difference of scientific notation. 0.00067 - 2.3 x 10⁻⁵

A. 6.47 x 10⁻⁴

B. 6.47 x 10⁻⁵

C. 4.4 x 10⁻⁵

D. 4.4 x 10¹

Answer: 7

Explanation:

x^2-4x=21

x^2-4x-21=0

(x+3)(x-7)=0

x=-3

x=7

*** if you need to find the positive # only, the ANSWER is 7****

The correct equation for the problem is x² - 4x = 21. By using the quadratic formula, we find that the number can be either 7 or -3.

The student provided a mistaken equation for the problem which is x² + 4x = 21, not x² + 4x 21 = 0. The correct equation that represents the problem 'The square of a number decreased by 4 times the number equals 21' is x² - 4x = 21. To solve this equation, we first bring the constants to one side to set the equation equal to zero:

x² - 4x - 21 = 0

Now we have a quadratic equation of the form ax² + bx + c = 0, where a = 1, b = -4, and c = -21. We will use the quadratic formula, which is:

x = (-b ± √(b² - 4ac)) / (2a)

Substituting the values of a, b, and c into the formula gives us:

x = (4 ± √((-4)² - 4(1)(-21))) / (2*1)

x = (4 ± √(16 + 84)) / 2

x = (4 ± √100) / 2

x = (4 ± 10) / 2

Thus, the solutions are x = (4 + 10) / 2 = 7 and x = (4 - 10) / 2 = -3.

Therefore, the numbers that satisfy the equation are 7 and -3.

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:

Answer:

1. EF≅HG

2. EF║HG

3. Definition of parallelogram

4. when two parallel lines are cut by a transversal, alternate interior angles are congruent

5. EK≅GK

   FK≅HK

Step-by-step explanation:

1. As per the properties of a parallelogram, the opposite sides are congruent.

hence in given parallelogram EFGH the two sides EF≅HG

2. As per the properties of a parallelogram, the opposite sides are parallel.

hence in given parallelogram EFGH the two sides EF║HG

3.  Definition of parallelogram: A quadrilateral is called a parallelogram if two of its opposite sides are parallel.

4. As per the properties of transversal lines, when two parallel lines are cut by a transversal, alternate interior angles are congruent.

5. As proven in given question ΔEKF≅ΔGKH, so as per the CPCTC

                      EK≅GK and FK≅HK

!

There are different properties that are ascribed to a shape. The statement or reason to fill each box are;

A parallelogram is known to be a shape that is said to be composed of four sides. Where the sides opposite each other are regarded as parallel. The Examples of parallelograms are; squares, rhombuses, etc.

Learn more about parallelogram  from

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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:

  11.7%

Step-by-step explanation:

The account balance (A) for a principal amount P and monthly interest rate r will be ...

  A = P(1 +r)^8

Then we can divide by P and take the 8th root to find r:

  A/P = (1+r)^8

  (A/P)^(1/8) = 1 +r

  (A/P)^(1/8) - 1 = r

Since this is the monthly rate, we need to multiply this value by 12 to find the annual interest rate on the account:

  annual rate = 12((A/P)^(1/8) -1) = 12((9779/9047)^(1/8) -1) ≈ 0.11728 ≈ 11.7%

[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:

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.

!

Answer:

12 ft-lbs is your answer

12ft-lbs that she has done

Answer:  [tex]\frac{15}{35}[/tex]

Step-by-step explanation:

Equivalent fractions are defined as those fractions that represent the same value but their numerators and denominators are different.

For a fraction in the form [tex]\frac{a}{b}[/tex] you can find an equivalent fraction by multiplying the numerator and the denominator by the same number "c":

[tex]\frac{a}{b}=\frac{a*c}{b*c}[/tex]

Then, for the fraction [tex]\frac{3}{7}[/tex] you have an equivalent fraction with denominator 35. This is obtained by multiplying the denominato 7 by 5.

Then, the numerator will be:

[tex]3*5=15[/tex]

So:

[tex]\frac{3*5}{7*5}=\frac{15}{35}[/tex]

Answer:

The equivalent fraction of 3/7 is 15/35

Step-by-step explanation:

It is given that, a fraction 3/7

To find the equivalent fraction

We have 3/7

some of equivalent fraction of 3/7 are

3/7 * 2/2 = 6/14

3/7 * 3/3 = 9/21

3/7 * 4/4 = 12/28

3/7 * 5/5 =15/35

3/7 * 6/6 =  18/42  ....

We need denominator 35

Therefore the correct answer is 15/35

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:

Notice you can factorize

[tex]x^5+5x^4-5x^3-25x^2+4x+20[/tex]

by grouping the terms as

[tex](x^5-5x^3+4x)+(5x^4-25x^2+20)=x(x^4-5x^2+4)+5(x^4-5x^2+4)[/tex]

[tex]\implies f(x)=(x+5)(x^4-5x^2+4)[/tex]

Then you know right away that [tex]x=-5[/tex] is a (real) root, so we eliminate C and D.

The remaining quartic can be factored easily:

[tex]x^4-5x^2+4=(x^2)^2-5x^2+4=(x^2-4)(x^2-1)=(x-2)(x+2)(x-1)(x+1)[/tex]

which admits four more (also real) roots, [tex]x=\pm2[/tex] and [tex]x=\pm1[/tex], so the answer is B.

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:

24 ˚

Step-by-step explanation:

Exterior angle of a regular    -sided polygon:

360 ˚/ n ⇒ 360 ˚/15 = 24 ˚

Answer:

A) 24

Step-by-step explanation:

Since the sum of the exterior angles is always 360 degrees, if you divide 360 degrees by 24 degrees you get 15 which is the number of equal exterior angles and therefore 15 vertices and sides to the polygon.

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:

  104°

Step-by-step explanation:

Even a crude diagram can be helpful. Half of angle ACD is the complement of the 64° angle made with diagonal BD. Since that complement, 26°, is half the bisected angle, which is half the measure of ∠BAD, the measure of ∠BAD must be 4×26° = 104°.

___

Opposite angles of a rhombus are congruent, and each diagonal is a bisector of the angles at its endpoints. The diagonals bisect each other and meet at right angles.

[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:

$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:

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:

  $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 \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:

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.

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]

I think these two are the right answer.

Answer:

25

Step-by-step explanation:

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

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

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:

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

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

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.

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