Type the integer that makes the following subtraction sentence true:

8 − ?= –1

The activation energy of the reaction is approximately 126.8 kJ/mol. The calculation was done using the Arrhenius equation and the natural logarithm of the rate constants at the two temperatures.

To calculate the activation energy of a reaction, we can use the Arrhenius equation:

k = A * e⁽⁻ᴱᵃ/ᴿᵀ⁾

where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.

We have two rate constants at different temperatures, so we can set up two equations:

k₁ = A * e⁽⁻ᴱᵃ/ᴿᵀ₁⁾

k₂ = A * e⁽⁻ᴱᵃ/ᴿᵀ₂⁾

We want to solve for Ea, so we can take the natural logarithm of both sides of each equation:

ln(k₁) = ln(A) - Ea/RT₁

ln(k₂) = ln(A) - Ea/RT₂

We can subtract the second equation from the first to eliminate ln(A):

ln(k₁) - ln(k₂) = Ea/R * (1/T₂ - 1/T₁)

Now we can solve for Ea:

Ea = -R * (ln(k₁) - ln(k₂)) / (1/T₂ - 1/T₁)

Plugging in the given values, we get:

Ea = -8.314 J/mol/K * (ln(6.20 x 10⁻⁴) - ln(2.39 x 10⁻²)) / (1/760 K - 1/700 K)

Ea ≈ 126.8 kJ/mol

Therefore, the activation energy of the reaction is approximately 126.8 kJ/mol.

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Answer:

A. the graph of a quadratic function y = (1/4)(x+3)(x-4)

Step-by-step explanation:

(1/4)(x+3)(x-4) = 0

x+3 = 0    or  x-4 = 0

x = -3  or   x = 4

For the others:

B.  -(1/4)(x-3)(x+4) = 0

x-3 = 0    or  x+4 = 0

x = 3  or   x = -4

C.  -(x+3)(x+4) = 0

x+3 = 0    or  x+4 = 0

Step-by-step explanation:

The graph of function y = 1/4 (x+3)(x-4) gives the zeros at -3 and 4, therefore option (a) is correct.

A function is a combination of different types of variable and constants in which for the different values of x the value of function y is unique.

Given that,

The function f has 0 at -3 and 4.

The function f has 0 at -3 and 4 implies that the value of function is 0, when  value of x are -3 and 4.

Solve with the help of options,

(a)

y = 1/4 (x + 3)(x - 4)

Substitute x = -3,

y = 1/4 (-3 + 3) (3 + 4)

y = 1/4 x 0 x 7

y = 0

Substitute x = 4,

y = 1/4 (4 + 3)(4 - 4)

y = 1/4 x 7 x 0

y = 0

The value of y is 0 at x = -3 and 4,

Therefore, option (A) is correct option.

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Answer:

−24x+21

Step-by-step explanation:

-24x+21 is equivalent to -7(2x-3)-10x.

(Please mark as brainliest. I'm trying to become Ace)

3/10ths if im not wrong

Answer:

40

Step-by-step explanation:

30 minutes times 2 is 60 minutes which is 1 hour.

20 miles times 2 is 40 miles

She went 40 miles in 1 hour.

Please give brainliest if I helped! :)

a. 800\(m^{2}\)

b. 96,568.54 ft^2

The formula for solving for surface area of a pyramid is: B + (1/2*P*l), with B being the area of the base, P being the perimeter of the base, and l being the slant of the pyramid.

Steps for a:

Steps for b:

Hope this helps!

Answer:

No he's too poor

Step-by-step explanation:

Answer:

10  yd

Step-by-step explanation:

Answer:

3 dollars

Step-by-step explanation:

20 dollars is his total

$20-2 dollar water bottle=18

18 dollars divided by 6 cupcakes equals 3 dollars for each cupcake.

Answer:

157.92 + d = ?

Step-by-step explanation: Since you don't the amount of what his grandmother gave him you substitute the "number" for a letter. Example A or D.

I hope this helps.

Answer: C.5

Step-by-step explanation:

Answer: 1.625

Step-by-step explanation:

13/8 = 1  5/8 = 1.625

Answer: Let the legs of the right triangle be a and b. We know that the radius of the inscribed circle is 4 cm, which means that the inradius is also 4 cm. The inradius is given by:

r = (a + b - c)/2

where c is the hypotenuse, so we can substitute the given values to get:

4 = (a + b - 35)/2

Multiplying both sides by 2, we get:

8 = a + b - 35

Adding 35 to both sides, we get:

a + b = 43

We also know that the area of the triangle is given by:

A = (ab)/2

where a and b are the legs of the triangle. We can use the Pythagorean theorem to relate the legs to the hypotenuse:

a^2 + b^2 = c^2

Substituting the given value for the hypotenuse, we get:

a^2 + b^2 = 35^2

Simplifying, we get:

a^2 + b^2 = 1225

Now we can use the equation for the sum of the legs to solve for one of the legs in terms of the other:

a + b = 43

b = 43 - a

Substituting this expression for b into the equation for the area, we get:

A = (a(43 - a))/2

Simplifying, we get:

A = (43a - a^2)/2

To find the maximum value of the area, we can take the derivative of A with respect to a and set it equal to 0:

dA/da = 43/2 - a = 0

Solving for a, we get:

a = 43/2

Substituting this value into the equation for the area, we get:

A = (43/2)(43/2 - 43/2)/2 = 0

This means that the area of the triangle is 0 when one of the legs has a length of 0, which is not possible. Therefore, the maximum area occurs when the legs have equal lengths, which means that the right triangle is an isosceles right triangle. In this case, we have:

a = b = (35/sqrt(2)) cm

Substituting these values into the equation for the area, we get:

A = (ab)/2 = ((35/sqrt(2))^2)/2 = 612.5 cm^2

Therefore, the area of the right triangle is 612.5 square centimeters.

Step-by-step explanation:

Answer:

Below

Step-by-step explanation:

0 ≤ t ≤ + ∞

Answer:

Step-by-step explanation:

We can use a proportion to solve this.

Let x = how long the room is on the map

So, x/32 = 0.5/4

Cross multiply

4x = 16

Divide by 4

x = 4

Check

4/32 = 0.5/4

4 x 4 = 32 x 0.5

16 = 16

Our answer is correct

Answer:

Step-by-step explanation:

I'm just going to go out on a limb here and assume that those are a set of poorly made parenthesis. This, then, would be your equation:

\(x+\frac{x}{7}+\frac{1}{11}(x+\frac{x}{7})=60\)

The first thing to do is distribute through the parenthesis to get:

\(x+\frac{x}{7}+\frac{x}{11}+\frac{x}{77}=60\)

Next is to get rid of the denominators by multiplying by the LCM of 77:

\(77(x+\frac{x}{7}+\frac{x}{11}+\frac{x}{77}=60)\) which gives you:

77x + 11x + 7x + x = 4620 and

96x = 4620 so

\(x=\frac{385}{8}\)

Answer: 48 pupils get the bus to the cinema and 36 pupils walk to the cinema.

Step-by-step explanation:

Let's suppose that there are a total of N pupils.

We know that N/4 walk to the cinema.

We know that N/3 get the bus to the cinema.

And the remainder is equal to 60 people.

Then:

N - N/4 - N/3 = 60

N*(1 - 1/4 - 1/3) = 60

N( 12/12 - 3/12 - 4/12) = 60

N*( 5/12) = 60

N = (12/5)*60 = 144

Then the number of pupils that walk to the cinema is N/4, or:

144/4 = 36

And the number of pupils that get the bus is N/3, or:

144/3 = 48.

Answer:

See attached image

Step-by-step explanation:

Use the FOIL method

First - multiply the first numbers inside the parentheses (y^2 and -2y)

Outer- multiply the first and last numbers inside the parentheses (y^2 and 7)

Inner - multiply the two numbers next to the closing and opening parentheses (6 and -2y)

Last- multiply the last two numbers in the parentheses. (6 and 7)

Then simplify to put it in standard form.

Answer:

pls ask in english pls ok tell in english

Answer:

89

Step-by-step explanation:

a^2 + b^2 =c^2

80^2 + 39^2=7921

(square root)    ,/7921 = 89

Answer:

4 oz

Step-by-step explanation:

1:4 is the ratio for this. in total, this makes 5 oz of paint. multipy 5 by 4 to get 20 oz. multiply the 1 oz of green paint by 4 as well.

Answer:

15x -45y +180

Step-by-step explanation:

5(3x)= 15x

5(26)= 130

5(-9y)= -45y

5(10)= 50

combine like terms:

15x - 45y +180

The percentage of actual yield is 60.66%.

The percentage of a number is the hundredth part of that number.

Given that the total yield is 872.7 grams and the actual yield is 529.4 grams.

The percentage is calculated by the formula given below.

\(Percentage\; of\; Yield = \dfrac {Actual \;Yield }{ Total\; Yield}\times 100\)

Substituting the values, we get the percentage,

\(Yield \;\% = \dfrac {529.4}{872.7}\times 100\)

\(Yeils\;\%=60.66\;\%\)

Hence we can conclude that the percentage of actual yield is 60.66%.

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1. The measure of AC = 8.4

2. The measure of AC' = 6

3. The measure of C'B' = 12.6

Lines in a plane that are consistently spaced apart are known as parallel lines. Parallel lines don't cross each other.

Given:

Segment B'C' is parallel to segment BC.

A line splits a triangle's sides in the same proportion if it runs parallel to one side and crosses the other sides at two different spots.

Then,

10/4 = 6/x

x = 2.4

The measure of AC = 2.4

And,

14/8.4 = 21/y

y = 12.6

The measure of C'B' = 12.6

Therefore, all the required values are given above.

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The more precise estimator ẏ₁ is the most efficient in estimating the average salary. With given values, the confidence interval is calculated to determine whether to accept the claim of a $50,000 mean salary.



In this scenario, we have two estimators for the average salary: ẏ₁, which uses precise data, and ẏ₂, which includes less precise data. The efficiency of the estimators depends on the variance of the data. If we compare the variances, Var(ẏ₁) = 0% and Var(ẏ₂) = o²(1 + 3c). Since Var(ẏ₁) is zero, it implies that ẏ₁ is the most efficient estimator. The answer does not depend on the value of c.

In the second part, with c = 0, we have Var(Y) = o². Given N = 300, s² = 20,000,000, and ẏ₁ = $48,000, we can use these values to construct a confidence interval. Using a 1% significance level, the critical value is 2.57 (from the standard normal distribution). The confidence interval is given by ẏ₁ ± 2.57 * sqrt(s²/N), which results in $48,000 ± 2.57 * sqrt(20,000,000/300). If this interval contains $50,000, we would accept your friend's claim; otherwise, we would reject it.

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Answer:

Step-by-step explanation:

2x-1>9

2x-1>9=0

2x-1=0-9

2x-1=-9

2x=-9+1

x=-8/2

x=-4

If Rachana randomly selects two mugs from the set, the probability that she gets two different mugs is 0.1556 or 15.56%.

To solve this problem, we can use the concept of combinations. Since there are 10 mugs in the set, there are 10 choose 2 = 45 ways to select two mugs without considering order.

Out of these 45 ways, we need to count the number of ways Rachana can select two different mugs. Since there are 3 different types of mugs, Rachana can choose any one of the three types for the first mug. There are 10 mugs in the set, out of which 3 belong to the chosen type. Therefore, the probability of choosing a mug of the chosen type is 3/10.

For the second mug, Rachana can choose from the remaining 9 mugs. Since she needs to choose a different type of mug, she can choose any one of the 2 remaining types. There are 7 mugs left from the other 2 types. Therefore, the probability of choosing a mug of a different type is (7/9) * 2/3 = 14/27.

Therefore, the probability of selecting two different mugs is the product of the probabilities of selecting a mug of the chosen type and a mug of a different type. This is given by (3/10) * (14/27) = 7/45, which is approximately 0.1556 or 15.56%.

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Complete question is:

Rachana has a set of ten mugs the set up is made of 3 different mugs. If Rachana randomly selects two mugs from the set, what is the probability that she gets two different mugs?

Answer:

Step-by-step explanation:

32 / 4 = 8 = length or width (because it is a square both are the same)

8 + 2 = 10

10 + 10 + 10 + 10 = 40 (perimeter of outer fence)

32(1.18) + 40(1.18) = $84.96