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Mandarinka [93]
3 years ago
13

Can you plz help me with this problem I’ve been stuck on it for a long time

Mathematics
2 answers:
lukranit [14]3 years ago
8 0

Answer:

B 1 inch = 16 ft

Step-by-step explanation:

We can use proportions to solve.  Put the drawing over the real life

3.5 inches         1 inch

----------------- = ------------

56 ft                    x ft

Using cross products

3.5 x = 56

Divide each side by 3.5

3.5x/3.5 = 56/3.5

x =16

So 1 inch = 16 ft

Tpy6a [65]3 years ago
6 0

I think the answer is B

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<img src="https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdx%7D%20%5Cint%20t%5E2%2B1%20%5C%20dt" id="TexFormula1" title="\frac{d}{dx} \
Kisachek [45]

Answer:

\displaystyle{\frac{d}{dx} \int \limits_{2x}^{x^2}  t^2+1 \ \text{dt} \ = \ 2x^5-8x^2+2x-2

Step-by-step explanation:

\displaystyle{\frac{d}{dx} \int \limits_{2x}^{x^2}  t^2+1 \ \text{dt} = \ ?

We can use Part I of the Fundamental Theorem of Calculus:

  • \displaystyle\frac{d}{dx} \int\limits^x_a \text{f(t) dt = f(x)}

Since we have two functions as the limits of integration, we can use one of the properties of integrals; the additivity rule.

The Additivity Rule for Integrals states that:

  • \displaystyle\int\limits^b_a \text{f(t) dt} + \int\limits^c_b \text{f(t) dt} = \int\limits^c_a \text{f(t) dt}

We can use this backward and break the integral into two parts. We can use any number for "b", but I will use 0 since it tends to make calculations simpler.

  • \displaystyle \frac{d}{dx} \int\limits^0_{2x} t^2+1 \text{ dt} \ + \ \frac{d}{dx} \int\limits^{x^2}_0 t^2+1 \text{ dt}

We want the variable to be the top limit of integration, so we can use the Order of Integration Rule to rewrite this.

The Order of Integration Rule states that:

  • \displaystyle\int\limits^b_a \text{f(t) dt}\  = -\int\limits^a_b \text{f(t) dt}

We can use this rule to our advantage by flipping the limits of integration on the first integral and adding a negative sign.

  • \displaystyle \frac{d}{dx} -\int\limits^{2x}_{0} t^2+1 \text{ dt} \ + \ \frac{d}{dx}  \int\limits^{x^2}_0 t^2+1 \text{ dt}  

Now we can take the derivative of the integrals by using the Fundamental Theorem of Calculus.

When taking the derivative of an integral, we can follow this notation:

  • \displaystyle \frac{d}{dx} \int\limits^u_a \text{f(t) dt} = \text{f(u)} \cdot \frac{d}{dx} [u]
  • where u represents any function other than a variable

For the first term, replace \text{t} with 2x, and apply the chain rule to the function. Do the same for the second term; replace

  • \displaystyle-[(2x)^2+1] \cdot (2) \ + \ [(x^2)^2 + 1] \cdot (2x)  

Simplify the expression by distributing 2 and 2x inside their respective parentheses.

  • [-(8x^2 +2)] + (2x^5 + 2x)
  • -8x^2 -2 + 2x^5 + 2x

Rearrange the terms to be in order from the highest degree to the lowest degree.

  • \displaystyle2x^5-8x^2+2x-2

This is the derivative of the given integral, and thus the solution to the problem.

6 0
3 years ago
Use the "at least once" rule to find the probability of getting at least one 2 in four rolls of a single fair die.
Alexandra [31]

Answer:

Probability of getting at least one 2 equals 0.5177

Step-by-step explanation:

The probability of at least one success is

P=1-(1-p)^{n}

where,

'p' is probability of success of 1 trail

'n' is number of events

We have probability of getting 2 is 1/6 thus 'p' = 1/6

Applying values we get

P=1-(1-\frac{1}{6})^{4}\\\\P= 0.51177

8 0
3 years ago
value system, as a river, and each stop along the river is a point where value was added. What was the starting point the one fu
dalvyx [7]

Answer:D. Raw chemicals

Step-by-step explanation: A value system in this context is the system which comprise of different processes or points where improvements or values are added to the initial materials as it flows along.

The starting point will be the point from where the raw materials are being introduced or added before the flow continue with consistent value addition.

This is similar to what happens in production or manufacturing process where the process starts with the addition of raw materials to the different points where value addition is taking place till it come out a finished product with improved value.

5 0
4 years ago
Select a number shown by the model . Check all that apply .
dexar [7]
D,E and F are correct
5 0
3 years ago
Read 2 more answers
Match the written mathematical operation to the equivalent symbolic form.
ki77a [65]

Answer:

the product of 2 and 9 — 3rd choice

the difference of 2 and 9 — 2nd choice

the square of 9 — 1st choice

the sum of 2 and 9 — 5th choice

the quotient of 2 and 9 — 4th choice

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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