What is Y

4-50
5-Y
6-150

After 18 hours the remaining quantity of the radioactive sample will be (A) 4.68 grams.

So, original radioactive substance = 3000 grams.

So, a number of half-lives in 18 hours:

Then, after 18 hours:

Therefore, after 18 hours the remaining quantity of the radioactive sample will be (A) 4.68 grams.

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The correct question is given below:
300 grams of a radioactive sample has a half-life of 3 hours. After 18 hours, the remaining quantity will be:

(A) 4.68 gm

(B) 2.34 gm

(C) 3.34 gm

(D) 9.37 gm

They tell us that it is distributed in a normal way, which means that the distribution has the following characteristics:

If teh standart deviation is 2.7 gallon and the avriabe is normal distributed we need to know the probability highlighted in the image above, when replacing in the formula with x greater than 25 we obtain:

Answer:

Step-by-step explanation:

Part A. The figure at the right is of 2 grain, storage silos. The diameter of each measures 24 feet and the height of the cylinder measures 51 feet. The height ...

The quadratic expression when ( x - 2) ( x - 7 ) is multiplied is x² - 9x + 14.

A polynomial of degree two or a quadratic polynomial that has two as the highest exponent of the variable. A quadratic polynomial will typically have the following form: p(x): ax² + bx + c, a ≠ 0.

A coefficient is a multiplicative factor in a polynomial term, a series term, or an expression; it often has the form of a number but can also take the form of any expression.

When an expression ( x - r )( x - s ) is multiplied, where r and s are integers, we obtain a quadratic polynomial.

Therefore, when ( x - 2 )( x - 7 ) is multiplied we get:

( x - 2 )( x - 7 ) = x( x - 7 ) - 2( x - 7 )

( x - 2 )( x - 7 ) = x² - 7x - 2x + 14

( x - 2 )( x  - 7 ) = x² - 9x + 14

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Answer:

Bro x =21

Step-by-step explanation:

X=21 and AM=14

As all the lines are same so all will be 7 and x will be 3 times 7 which is 21 and in the AM case there 7 is 2 times thus multiply 7 by 2 for 14

Answer:

[tex]a\:\dfrac{\sqrt{a^3}}{a^4} =\dfrac{\sqrt{a}}{a^2}[/tex]

Step-by-step explanation:

I believe this question is wrongly or part of it has been truncated in the screenshot

I have simplified the original expression and checked my answer.

[tex]\mathrm Simplify \;\;a\dfrac{\sqrt{a^3}}{a^4}\\\\\sqrt{a^3} = a^{\dfrac{3}{2}} = a^{(1 + \frac{1}{2})} = a \cdot a^\frac{1}{2} = a \sqrt{a} \\\\a\dfrac{\sqrt{a^3}}{a^4}\\\\ = \dfrac{a\cdot a\cdot \sqrt{a}}{a^4}\\\\= \dfrac{a^2\sqrt{a}}{a^4}\\\\= \dfrac{\sqrt{a}}{a^{(4-2)}}\\\\\\=\dfrac{\sqrt{a}}{a^2}[/tex]

n = - 3

How is the given equation  [tex]5^{n} =\frac{1}{125}[/tex]   solved to find n ?

Converting the fraction to negative exponential form,

[tex]5^{n} ={125}^{-1} \\\\5^{n} ={(5^{3})}^{-1} \\\\\text{We know } (a^{n} )^{m} =a^{nm} \\\\\text{Applying this exponent power rule in the above expression},\\\\5^{n} = 5^{-3} \\\\\text{As the corresponding exponents are equal}\\\\n= -3[/tex]

What are laws of exponents?

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Answer:

15

Step-by-step explanation:

Divide it into triangles, then solve for area.

Answer:

1

Step-by-step explanation:

from the rule of exponents

• [tex]a^{0}[/tex] = 1 , then

[tex](5x)^{0}[/tex] = 1

Answer: $860 this week.

Step-by-step explanation:

Paul worked 40 hours this week, and makes 21.50 dollars an hour. Gross pay means the amount of money paid before taxes.

So we don't need to calculate any taxes, which means all we need to do is multiply 21.50 by 40 hours, since he makes 21.50 an hour, and he worked 40 hours.

Answer:

n < - 1

Step-by-step explanation:

- 2(n - 4.5) > 11 ← distribute parenthesis on left side

- 2n + 9 > 11 ( subtract 9 from both sides )

- 2n > 2

divide both sides by - 2, reversing the symbol as a result of dividing by a negative quantity.

n < - 1

Answer:

n < -1

Step-by-step explanation:

-2(n -4.5) > 11 (multiply the contents within the bracket by -2.)

-2n + 9 > 11 (- × - = +)

-2n > 11 - 9 [ like terms have to be with each other (transposing); and when u transpose a number it changes signs.]

-2n > 2 (divide both sides by negative 2)

n < -1 (sign changes as a reslut of the negative division)

The value of x in this geometric sequence is equal to √2.

In Mathematics, the nth term of a geometric sequence can be calculated by using this mathematical expression:

aₙ = a₁rⁿ⁻¹

Where:

For this exercise, we would formulate an equation from the common ratio of this geometric sequence as follows:

r = a₂/a₁ = a₃/a₁

Substituting the given parameters into the common ratio formula, we have;

1/√X + 1 = √x - 1/1

Next, we would take the square of both sides, we have:

1/x + 1 = x - 1/1

Cross-multiplying, we have:

(x + 1)(x - 1) = 1

x² - x + x - 1 = 1

x² - 1 = 1

Adding 1 to both sides, we have:

x² - 1 + 1 = 1 + 1

x² = 1 + 1

x² = 2

x = √2

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Given:

The number of faces =8.

Required:

We need to find the polyhedron with 8 faces.

Explanation:

Recall that the tetrahedron is a polyhedron composed of four triangular faces

The number of faces in tetrahedron =4.

Recall that the octahedron is a polyhedron with 8 faces.

The number of faces in the octahedron= 8.

Recall that the dodecahedron is a polyhedron with 12 faces.

The number of faces in the dodecahedron = 12.

Recall that the icosahedron is a polyhedron with 20 faces.

The number of faces in icosahedron =20.

Final answer:

octahedron

Answer:

Standard deviation measures the dispersion of a dataset relative to its mean

Step-by-step explanation:

Answer:

8, B

Step-by-step explanation:

[tex]-6(3-r)=30 \\ \\ -18+6r=30 \\ \\ 6r=48 \\ \\ r=8[/tex]

0.030 is the probability that three students chosen at random all study History.

Mathematical explanations of the likelihood that an event will occur or that a statement is true are referred to as probabilities. The probability of an event is a number between 0 and 1, where, broadly speaking, 0 represents the event's impossibility and 1 implies certainty. Mathematics' discipline of probability investigates potential outcomes of events as well as their relative likelihoods and distributions.

Given Data

12 students who study Geography(G),

11 students who study History(H)

10 students who study Economics(E)

Probability that three students chosen at random all study History

[tex]\frac{11}{3}[/tex] ÷ [tex]\frac{33}{3}[/tex]

[tex]\frac{11}{3}[/tex] ×[tex]\frac{3}{33}[/tex]

0.030

0.030 is the probability that three students chosen at random all study History.

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Answer:

h(x) = 9x-18 is the correct inverse function

Step-by-step explanation:

f(x) -> y (first we need to rewrite the equation with y)

y= 1/9x+2 (next we need to solve for x)

y=1/9x

-2 -2  (subtract 2 from both sides)

y-2= 1/9x (multiply 9 on both sides

9y-18= x (and lastly switch back x and y)

y = 9x - 18 (if a real equation than write h(x) or [tex]f(x)^{-1}[/tex], if not real equation keep it in y)

h(x) = 9x-18

Hope this helps!

Answer:

9x–18

you can ask questions for clarification

[tex]\frac{x^{2} - 9}{3x^{2} + 8x - 3 } : \frac{x - 3}{x + 2} =\frac{(x^2 - 9)(x + 2)}{(3x^2 +8x - 3)(x - 3)} =\frac{x^3 + 2x^2 - 9x - 18}{3x^3 - 9x^2 + 8x^2 - 24x - 3x + 9} =\frac{ x^3 + 2x^2 - 9x - 18}{3x^3 - x^2 - 27x + 9} = \frac{0}{3 - 3x} = 0[/tex]

Answer:

0

Step-by-step explanation:

when you multiply, and add and subtract it all up, you eventually get 0 over 3-3x. what is 0 divided by 3-3x? 0

The graph of the given points form the rectangle is attached below.

Graph:

The graph is defined as the pictorial representation or a diagram that represents data or values in an organized manner.

Given,

The points are (2, 1),(2, 5), (7, 1), and (7, 5).

Here we need to plot the graph and we have to identify whether it will form the rectangle.

First, we have to do the following in order to solve it,

Therefore, the resulting graph is attached below.

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Answer:

one tenth of 100.5 is 10.05 so 10.05$

Step-by-step explanation:

First take 100.5 multiply by one tenth=10.05$ or ten dollars and 5 cents

After completing 6 week and 8 days, the amount in the bank account will be $280.

The initial balance in the bank account = $60.

Allowance deposit per week = $7.

Paycheck deposit per week = $25.

Let 'w' be the number of week.

Th equation of the total amount 'b' after 'w' week becomes;

b = 60 + (25+7)w

As, the total amount becomes $280, after the week .

Put b = 280 in equation and find w.

280 = 60 + (25+7)w

Simplifying;

220 = 32w

w = 6.875

Thus, after completing 6 week and 8 days, the amount in the bank account will be $280.

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A = votes to Abe

G = votes to George

we know that all votes together were 539, so A + G = 539, we also know that George got 23  more than Abe, so "G = A + 23"

[tex]\stackrel{Abe's}{A}~~ + ~~\stackrel{George's}{(A+23)}~~ = ~~\stackrel{total}{539}\implies 2A+23=539\implies 2A=516 \\\\\\ A=\cfrac{516}{2}\implies \boxed{\stackrel{Abe}{A=258}}\hspace{12em}\boxed{\underset{George}{\stackrel{258~~ + ~~23}{281}}}[/tex]

The balloon's vertical distance above the ground is equal to 633.7 feet

What is angle of depression?
The angle of depression is the angle between the horizontal line and the observation of the object from the horizontal line.

Given data ,

we have Angle of depression = 35°

Base distance D = 905 ft

Let the vertical distance be H

To calculate the vertical distance H of the balloon above the ground , we use the angle of depression and the base distance.

Therefore , using the trigonometric identities ,

sin = Opposite / Hypotenuse

cos = Adjacent / Hypotenuse

tan = Opposite / Adjacent

So , tan  Ф = tan 35°

                  = H / D

      tan 35°= H / 905

H = tan 35° x 905 ft

H = 0.7002075 x 905

H = 633.7 ft

Hence ,  vertical distance is equal to 633.7 ft

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Answer: 20 children’s tickets and 47 adult’s tickets

20 children's tickets were sold and 47 adult tickets were sold.

People bought tickets at the theater and $704 was collected.

charge - $7 for children and $12 for adults.

let, x number of children and y number of an adult take admission,

then, according to question ->

7*x+12*y=704; said eq. 1

and, given 67 people bought tickets at the theater.

x + y=67; said eq. 2

now, on solving these equations,

we get,

multiply eq.2 by 7 then subtract with eq. 1

then we get, y=47 then put the value of y in eq. 2 we get x=20;

so,

20 children's tickets were sold and 47 adult tickets were sold.

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Answer: $2500

Step-by-step explanation:

Let the amount she sells in dollars be x. Then,

[tex]450+0.06x \geq 600\\\\0.06x \geq 150\\\\x \geq 2500[/tex]

The author shows that computer programs make it faster to make changes to blur prints.

A computer program is a set of instructions written in a programming language that a computer is supposed to obey.

Hence it is clear that the author shows that computer programs make it much faster to make changes to blue prints.

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Answer:

667/45 or 14 37/45

Step-by-step explanation:

you have to convert 5 4/5 x 2 5/9 then you multiply those numbers but simply them which would be 29/5 x 23/9 then you get 667/45 or 14 37/45 as an alternative form

hope this helps

Based on the line and the points that it goes through, the equation with the same proportional relationship as the graph is y = three-fifths x.

To find the relationship of the points on the line in the coordinate plane, you need to find the slope of the line. The slope can be found by the formula:

= Change in y / Change in x

Solving for the slope gives:

= (3 - 0) / (5 - 0)

= 3 / 5

For equations to be proportional, they need to have the same slope. With the slope of the line being 3/5, the equation that would have the same proportional relationship is:

y = 3/5x

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Answer:

27/8 or 3⅜

Step-by-step explanation:

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Answer:

I believe the answer is 2^3x3^2