Strontium-90 has a half-life of 28.1 years. How many years will it take for a sample of Strontium-90 to decay to 25% of its initial quantity?

Answer:37.5 average

Step-by-step explanation:I think

Answer:

The total cost of the two toys before the discount is VND 45,000 + VND 25,000 = VND 70,000.

Step-by-step explanation:

The discount is 10% of the total cost, which is 0.1 x VND 70,000 = VND 7,000.

Therefore, the final cost after the discount is VND 70,000 - VND 7,000 = VND 63,000.

Nam will have to pay VND 63,000 to buy the two toys after the discount.

Answer:36000

Step-by-step explanation:

He saves 36000 dollars

30.8 pounds of the individual's weight is made up of fat, rounded to the nearest tenth.

To calculate the pounds of body fat, we need to multiply the body weight by the body fat percentage in decimal form:
173 pounds x 0.178 = 30.794 pounds
Therefore, approximately 30.8 pounds of his weight is made up of fat.
To find out how many pounds of an individual's weight is made up of fat, you can use the following formula:
Total weight x Body fat percentage = Fat weight
In this case:
173 pounds x 0.178 (17.8%) ≈ 30.8 pounds
So, approximately 30.8 pounds of the individual's weight is made up of fat, rounded to the nearest tenth.

For more such questions on pounds , Visit:

https://brainly.com/question/498964

#SPJ11

Answer:

B)

Step-by-step explanation:

 Geometric mean:

     [tex]\sf 5 , a_2,a_3, a_4, a_5,1215[/tex]

       [tex]\bf a_1 = first \ term = 5[/tex]

n = number of terms = 6

r = common ratio

            [tex]\boxed{\bf a_n = a_1 * r^{n-1}}[/tex]

             [tex]a^{6} = 5 *r^{6-1}\\\\1215 = 5*r^5\\\\ \dfrac{1215}{5}=r^5\\\\243=r^5\\\\3^5=r^5[/tex]

As powers are same, compare the bases,

        r = 3

Each term is obtained by multiplying the previous term by the common ratio. r = 3

    [tex]\sf a_2 = 5*3 = 15\\\\a_3= 15*3 = 45\\\\a_4 = 45 *3 =135\\\\ a_5 = 135*3 = 405[/tex]

Answer:

The total number of possible outcomes for the math quiz is 16

Step-by-step explanation:

Austin's rate of motion is (1/70)π Radians per second.

To determine Austin's rate of motion in radians per second, we need to use the formula for angular velocity:

ω = Δθ / Δt

Where:

ω = angular velocity (in radians per second)

Δθ = change in angular displacement (in radians)

Δt = change in time (in seconds)

We know that Austin runs three-quarters of a circular track, which means he covers an arc length that is equal to three-quarters of the circumference of the circle. Let's call the radius of the circle "r". Then, the arc length covered by Austin is given by:

s = (3/4) * 2πr

s = (3/2)πr

We also know that it takes Austin 1 minute and 45 seconds to cover this distance. This is the same as 105 seconds (since 1 minute = 60 seconds).

So, Δt = 105 seconds

Now, we can calculate the change in angular displacement (Δθ). The total angle around a circle is 2π radians, so the angle covered by Austin is given by:

Δθ = (3/4) * 2π

Δθ = (3/2)π

Therefore, Austin's rate of motion (ω) in radians per second is:

ω = Δθ / Δt

ω = [(3/2)π] / 105

ω = (3/210)π

ω = (1/70)π radians per second

So, Austin's rate of motion is (1/70)π radians per second.

To know more about Radians .

https://brainly.com/question/19758686

#SPJ11

The value of w is 9.

We can use the slope formula to find the value of w.

The slope formula is:

m =[tex](y_2 - y_1) / (x_2 - x_1)[/tex]

where m is the slope of the line and [tex](x_1, y_1)[/tex]and [tex](x_2, y_2)[/tex] are two points on the line.

We know that the slope of the line is 7, and the two points on the line are (-5, -5) and (-3, w). So we can plug in these values into the slope formula and solve for w:

7 = (w - (-5)) / (-3 - (-5))

Simplifying the right-hand side, we get:

7 = (w + 5) / 2

Multiplying both sides by 2, we get:

14 = w + 5

Subtracting 5 from both sides, we get:

w = 9

Therefore, the value of w is 9.

Know more about  line   here:

https://brainly.com/question/26961508

#SPJ11

The value of c for same sign of roots are,

⇒ c > 0

Given that;

Quadratic equation is,

⇒ x² - 2x + c = 0

Since, We know that;

For the roots of ax²+bx+c=0 to have same signs,

a(x2+b/ax+c/a), the last term, i.e. c/a>0, because if you factorize the quadratic, to arrive at positive constant you either have to have two negative numbers multiplied or two positive multiplied by each other.

Here,

Quadratic equation is,

⇒ x² - 2x + c = 0

Hence, The condition for same sign of roots are,

⇒ c > 0

Thus, The value of c for same sign of roots are,

⇒ c > 0

Learn more about the quadratic equation visit:

brainly.com/question/1214333

#SPJ1

Answer:

2. (i)  p = 4

   (ii)  p < -4

   (iii)  0 < c ≤ 1

Step-by-step explanation:

To find the value(s) of p for which x² - 2x - 3 = p will have the equal or real roots, we can use the discriminant formula.

[tex]\boxed{\begin{minipage}{9 cm}\underline{Discriminant}\\\\$b^2-4ac$ \quad when $ax^2+bx+c=0$\\\\when $b^2-4ac > 0 \implies$ two real roots.\\when $b^2-4ac=0 \implies$ one real root (equal roots).\\when $b^2-4ac < 0 \implies$ no real roots (two complex roots).\\\end{minipage}}[/tex]

Rearrange the given equation so that it is in the form ax² + bx + c = 0:

[tex]x^2-2x-3-p=0[/tex]

Therefore, the values of a, b and c are:

To find the value of p for which the given quadratic has equal roots, substitute the values of a, b and c into the discriminant formula, set it equal to zero, and solve for p:

[tex]\begin{aligned}b^2-4ac&=0\\(-2)^2-4(1)(-3-p)&=0\\4-4(-3-p)&=0\\4+12+4p&=0\\16+4p&=0\\4p&=-16\\p&=-4\end{aligned}[/tex]

Therefore, the value of p for which the given quadratic will have equal roots is p = -4.

Rearrange the given equation so that it is in the form ax² + bx + c = 0:

[tex]x^2-2x-3-p=0[/tex]

Therefore, the values of a, b and c are:

To find the values of p for which the given quadratic has no real roots, substitute the values of a, b and c into the discriminant formula, set it to less than zero, and solve for p:

[tex]\begin{aligned}b^2-4ac& < 0\\(-2)^2-4(1)(-3-p)& < 0\\4-4(-3-p)& < 0\\4+12+4p& < 0\\16+4p& < 0\\4p& < - 16\\p& < -4\end{aligned}[/tex]

Therefore, the value of p for which the given quadratic will no real roots is p < -4.

For the roots of x² - 2x + c = 0 to have the same sign, both roots either have to be less that 0 or more than 0.

From part (i), we know that x² - 2x - 3 - p = 0 has equal roots when p = -4.

Substitute p = -4 into the equation:

[tex]\begin{aligned}x^2 - 2x - 3 - p &= 0\\x^2-2x-3-(-4)&=0\\x^2-2x-3+4&=0\\x^2-2x+1&=0\end{aligned}[/tex]

Comparing this to x² - 2x + c = 0, we can see that x² - 2x + c = 0 has equal roots when c = 1.

The leading coefficient of x² - 2x + c = 0 is positive, so the parabola opens upwards. We know it has equal roots when c = 1, so the vertex touches the x-axis when c = 1. Therefore, it has no real roots when c > 1 (since the vertex will be above the x-axis in this interval).

Therefore, we can determine that x² - 2x + c = 0 has two real roots when c ≤ 1.

When c = 0, the equation of the parabola is y = x² - 2x.

The roots are the points at which the curve crosses the x-axis (when y = 0). As y = 0 when x = 0, one of the roots is (0, 0) when c = 0.

Therefore, when c < 0, one root will be negative and the other will be positive.

Note there is no value of c where both roots are negative, as the x-value of the vertex is positive.

So the values of c for which the roots of x² - 2x + c = 0 will have the same sign (positive) are 0 < c ≤ 1.

Answer:

All you have to do is to find the area of a circle to know the area it will contain.

Step-by-step explanation:

3. d=150cm= 150/100m=1.5m

r= 1.5/2= 0.75m

since a drum is circular under it will take a circular area

Area of a circle=πr^2

=π×(0.75)^2

=0.5625π = 1.77m^2

4. r=48dm=48/10=4.8m

since the clock is circular it will contact a circular area

Area of a circle= πr^2

=π(4.8)^2

=23.04π= 72.38m^2

5. since it's circular

C=75cm=75/100m=0.75m

Circumference of a circle=2πr

0.75=2πr

r=0.75/2π

r=0.119m

Area of a circle= πr^2

=π×(0.119)^2

=0.045m^2

I hope it helps.

The height of the cylinder is determined as 36.2 inches.

The height of the cylinder is calculated by applying the formula for surface area of a cylinder as shown below;

S.A = 2πr(r + h)

where;

The height of the cylinder is calculated as follows;

2,285.92 = 2π x 8.2 (8.2 + h)

2,285.92 = 51.52(8.2 + h)

8.2 + h = 2,285.92/51.52

8.2 + h = 44.37

h = 36.2 inches

Thus, the height of the cylinder for the given radius and surface area is determined by using the equation for surface area of a cylinder.

Learn more about height of cylinder here: https://brainly.com/question/28247116

#SPJ1

The complete question is below:

The surface area of a cylinder is 2,285.92 square inches. What is the height? if the radius of the cylinder is 8.2 inches.

The first derivative of the inverse trigonometric function is equal to f'(x) = - 2 / [1 + (2 · x + 1)².

Herein we find the definition of an inverse trigonometric function, whose first derivative must be found by using derivative rules and especially derivative formulas for inverse trigonometric functions and chain rule. First, write the original function:

f(x) = cot⁻¹ (2 · x + 1)

Second, use derivative rules to determine the derivative:

f'(x) = [- 1 / [1 + (2 · x + 1)²]] · 2

f'(x) = - 2 / [1 + (2 · x + 1)²

To learn more on derivatives: https://brainly.com/question/25324584

#SPJ1

The value of each angle 6x + 7 and 4x + 3 will be 55° and 35°, respectively.

Given that:

Angles, ∠1 = 6x + 7 and ∠2 = 4x + 3

Two angles are said to be complementary angles if their sum is 90 degrees.

The equation is given as,

∠1 + ∠2 = 90°

6x + 7 + 4x + 3 = 90°

10x + 10 = 90°

10x = 80°

x = 8

The value of each angle is calculated as,

∠1 = 6 * 8 + 7

∠1 = 55°

∠2 = 4 * 8 + 3

∠2 = 35°

More about the angled link is given below.

https://brainly.com/question/15767203

#SPJ1

Answer:

length = 7 width = 2

Step-by-step explanation:

for the perimeter 7+7+2+2 is 18 and the area is 7×2 is 14 so the length is 7 and width is 2

The mean of the distribution of the sample means (sampling distribution) for all possible samples of size 81 that could be drawn from the parent population of GPAs is equal to the mean of the parent population of GPAs.

The mean of the distribution of the sample means (sampling distribution) for all possible samples of size 81 that could be drawn from the parent population of GPAs is equal to the mean of the parent population. This is due to the central limit theorem, which states that as the sample size increases, the distribution of sample means approaches a normal distribution with a mean equal to the population mean and a standard deviation equal to the population standard deviation divided by the square root of the sample size.
Therefore, if we were to take all possible samples of size 81 from the population of GPAs and calculate the mean of each sample, the distribution of these means would be approximately normal with a mean equal to the population mean of GPAs. This means that if we take a large number of samples of size 81 and calculate the mean of each sample, the average of these means will be very close to the population mean of GPAs.
In conclusion, the mean of the distribution of the sample means (sampling distribution) for all possible samples of size 81 that could be drawn from the parent population of GPAs is equal to the mean of the parent population of GPAs.

For more questions on  sample means

https://brainly.com/question/30886063

#SPJ11

Answer:

r(x) = x(x - 7)

Step-by-step explanation:

given the roots of a parabola x = a , x = b , then

the corresponding factors are (x - a) and (x - b)

from the graph the roots are where the graph crosses the x- axis

the graph crosses the x- axis at x = 0 and x = 7 , then

the corresponding factors are (x - 0) and (x - 7) , that is x and (x - 7)

the equation is then the product of the factors , that is

r(x) = x(x - 7)

Answer:

train is the mode of transportation that can be use

Answer:

50%.

Step-by-step explanation:

If the die is perfectly balanced, the probability of rolling an odd number is 3 out of 6, or 50%.

The remainder when dividing

[tex](10m^8 + 4m^6 + 10m^5) by (2m^2 + 5m^6 + 4m^4 + 10m^3)[/tex] is

[tex]-25m^{12} - 20m^{10} - 50m^9 + 4m^6 + 10m^5.[/tex]

To find the remainder when dividing

[tex](10m^8 + 4m^6 + 10m^5) by (2m^2 + 5m^6 + 4m^4 + 10m^3),[/tex] we can use polynomial long division.

The dividend is[tex](10m^8 + 4m^6 + 10m^5)[/tex] and the divisor is [tex](2m^2 + 5m^6 + 4m^4 + 10m^3).[/tex]

Starting with the highest degree term, we divide ([tex]10m^8[/tex]) by ([tex]2m^2[/tex]) which gives us [tex]5m^6[/tex].

Next, we multiply the entire divisor [tex](2m^2 + 5m^6 + 4m^4 + 10m^3)[/tex] by [tex]5m^6[/tex], which gives us ([tex]10m^8 + 25m^{12} + 20m^{10} + 50m^9[/tex]).

We then subtract this product from the original dividend:

[tex](10m^8 + 4m^6 + 10m^5) - (10m^8 + 25m^{12} + 20m^{10} + 50m^9)[/tex] =[tex]-25m^{12} - 20m^{10} - 50m^9 + 4m^6 + 10m^5.[/tex]

We repeat the process with the new dividend ([tex]-25m^{12} - 20m^{10} - 50m^9 + 4m^6 + 10m^5[/tex]) and the divisor ([tex]2m^2 + 5m^6 + 4m^4 + 10m^3[/tex]).

Continuing the long division process, we eventually find the remainder to be: [tex]-25m^{12} - 20m^{10} - 50m^9 + 4m^6 + 10m^5.[/tex]

Therefore, the remainder when dividing ([tex]10m^8 + 4m^6 + 10m^5[/tex]) by ([tex]2m^2 + 5m^6 + 4m^4 + 10m^3[/tex]) is [tex]-25m^{12} - 20m^{10} - 50m^9 + 4m^6 + 10m^5[/tex].

For such more questions on remainder:

https://brainly.com/question/29347810

#SPJ11

Note the full question is:

Divide. (10m8 + 4m6 + 10m5) ÷ 2m2 5m6 + 4m4 + 10m3 5m6 + 2m4 + 10m5 5m6 + 2m4 + 5m3 5m8 + 2m6 + 5m5

What is the reminder

Answer: A ≈ 127.31 units²

Step-by-step explanation:

     We can use the given formula for the area of a regular hexagon, where a is equal to a given side (here, that is 7).

        [tex]\displaystyle A=\frac{3\sqrt{3} }{2} a^2[/tex]

     We will substitute known values and solve by computing and simplifying.

        [tex]\displaystyle A=\frac{3\sqrt{3} }{2} a^2[/tex]

        [tex]\displaystyle A=\frac{3\sqrt{3} }{2} (7)^2[/tex]

        [tex]\displaystyle A=\frac{5.1961524}{2} 49[/tex]

        [tex]\displaystyle A=(2.59807621)(49)[/tex]

        [tex]\displaystyle A=127.3057[/tex]

        [tex]\displaystyle A\approx 127.31[/tex]

Answer:

8

Step-by-step explanation:

I will just calculate the population of every detail for ease.
800 total students.
800 * 60% or 0.6 = 480
480 girls.
480 * 50% or 0.5 = 240
240 music class girls.
240 * 10% or 0.1 = 24
24 music class girls.
so 24 music class girls that are into volleyball and 32 team girls.
32-24 = 8
8 of the team girls are not into music.

Answer: 0.68

Step-by-step explanation:

The perimeter of the figure is 24.50 feet feet, and the area of the figure is 45.68 square feet

From the question, we have the following parameters that can be used in our computation:

Radius, r = 4 feet (see attachment)

The perimeter of the figure is

Perimeter = Circumference of 3/4 circle + Perimeter of triangle - 2r

So, we have

Perimeter  = 3/4 * 2 * 3.14 * 4 + 4 + 4 + 4√2 - 2 * 4

Evalate

Perimeter  = 24.50 feet

The area of the figure is:

Area = Area of 3/4 circle + Area of triangle

So, we have

Area = 3/4 * 3.14 * 4² + 1/2 * 4 * 4

Evaluate

Area = 45.68

Hence, the area is 45.68 square feet

Read more about area at

https://brainly.com/question/24487155

#SPJ1

The solution to the system of equations, using the Gauss-Jordan method, is given as follows:

[tex]\left[\begin{array}{cccc}1&0&0&14.28\\0&1&0&-21.4\\0&0&1&1.2\end{array}\right][/tex]

The matrix representing the system of equations is given as follows:

[tex]\left[\begin{array}{cccc}-5&-3&-4&-12\\0&-2&-7&38\\0&1&4&-22\end{array}\right][/tex]

First we want a value of 1 at line 1, column 1, hence we multiply the first line by -1/5, that is:

R1 -> -1/5R1

Hence:

[tex]\left[\begin{array}{cccc}1&0.6&0.8&2.4\\0&-2&-7&38\\0&1&4&-22\end{array}\right][/tex]

First we want a value of 1 at line 2, column 2, hence we multiply the second line by -1/2, that is:

R2 -> -1/2R2

Hence:

[tex]\left[\begin{array}{cccc}1&0.6&0.8&2.4\\0&1&1.5&-19\\0&1&4&-22\end{array}\right][/tex]

We want an element of zero at line 3, column 2, hence:

R3 -> R3 - R2

Hence:

[tex]\left[\begin{array}{cccc}1&0.6&0.8&2.4\\0&1&1.5&-19\\0&0&2.5&-3\end{array}\right][/tex]

First we want a value of 1 at line 3, column 3, hence we multiply the third line by 2.5, that is:

R3 -> 1/2.5R3

Hence:

[tex]\left[\begin{array}{cccc}1&0.6&0.8&2.4\\0&1&1.5&-19\\0&0&1&1.2\end{array}\right][/tex]

Then the solution to the system of equations is given as follows:

Hence the row-echelon form is given as follows:

[tex]\left[\begin{array}{cccc}1&0&0&14.28\\0&1&0&-21.4\\0&0&1&1.2\end{array}\right][/tex]

More can be learned about the row echelon form of matrices at https://brainly.com/question/28968080

#SPJ1

Step-by-step explanation:

If side 1 and side 2 are LEGS of the triangle, then hypotenuse is found by

hyp^2 = 9^2 + 3^2     using pythagorean theorem

hyp^2 = 90

hyp = sqrt 90  = 3 sqt 10 =9.5 units

If hyp is 9   and  3 is one leg:

9^2 = 3^2 + L^2

L = 6 sqrt 2 =8.5 units

The requried probability that the mean of a sample of 70 computers would differ from the population means by less than 1.9 months is 0.8671, rounded to four decimal places.

The mean of the sampling distribution of the sample means is:

u = 105

and the variance of the sampling distribution of the sample means is:

σ² = 81/70

We can standardize the distribution of the sample means by using the z-score formula:

z = (x - u) / (σ/ √(n))

where x is the sample mean, mu is the population mean, sigma is the population standard deviation, and n is the sample size.

We want to find the probability that the sample mean differs from the population mean by less than 1.9 months, or |x - u| < 1.9. This is equivalent to finding the probability that the standardized sample mean falls within the range:

-1.9 / (σ/ √(n)) < z < 1.9 / (σ/ √(n))

Substituting the values we have, we get:

-1.9 / (9 / √(70)) < z < 1.9 / (9 / √(70))

Simplifying, we get:

-1.1158 < z < 1.1158

Using a standard normal distribution table, we can find the probability that the z-score falls within this range:

P(-1.1158 < z < 1.1158) = 0.8671

Therefore, the probability that the mean of a sample of 70 computers would differ from the population means by less than 1.9 months is 0.8671, rounded to four decimal places.

Learn more about statistics here:

https://brainly.com/question/31577270

#SPJ1