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Stella [2.4K]
3 years ago
14

Can someone help me What one

Mathematics
1 answer:
Sav [38]3 years ago
5 0

Answer:

try the second one sorry if its wrong report me if it is

Step-by-step explanation:

hope this help

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Two freight trucks are traveling to the same destination, and each are traveling at a constant speed. Truck A is 187 miles away
Reptile [31]

Step-by-step explanation:

Uhm, try multiplying the destinations of chuck a B and see what they both start a diet and then where they ended at the end if that makes sense

4 0
3 years ago
Find the sum of the following series
vazorg [7]

Answer:

a) 820

b)450

c)  -540

d) -294

e) 1440

f) 1425

Step-by-step explanation:

a) it is an arithmetic progression with ratio=4

   a1=3,

     a2=3+r=3+4=7.....

    a20=a1+19r

so a20=3+19*4=3+76=79

S=(a1+an)*n/2 where n=20

so S=(3+79)*20/2=820

b) a15=a1+14*r=2+14*4=2+56=58

S=(a1+a15)*15/2=(2+58)*15/2=60*15/2=30*15=450

It is the same formula for all  the exercises

S=(a1+an)*n/2 ,     where n is the number of terms

c) a40=30+39*(-3)=30-87=-57

So S=(30-57)*40/2=-540

d) a14=5+13*(-4)=5-52=-47

S=(5-47)*14/2=-42*14/2=-42*7=-294

e) it is 5+7+9+......+75

nr of  terms  = (an-a1) :r+1=(75-5):2+1=36

S=(5+75)*36/2=36*40=1440

f) ratio=7-4=3

the  same formula for n= (91-4):3+1=87:3+1=29+1=30

S=(4+91)*30/2=95*30/2=2850/2=1425

8 0
3 years ago
Security can be an issue with the use of Atms<br><br> A.True<br><br> B.False
shutvik [7]
A. True because you have to worry about someone stealing your money or someone looking over your shoulder to get your secret 4 digit number
7 0
3 years ago
The portion of the parabola y²=4ax above the x-axis, where is form 0 to h is revolved about the x-axis. Show that the surface ar
castortr0y [4]

Answer:

See below for Part A.

Part B)

\displaystyle h=\Big(\frac{125}{\pi}+27\Big)^\frac{2}{3}-9\approx7.4614

Step-by-step explanation:

Part A)

The parabola given by the equation:

y^2=4ax

From 0 to <em>h</em> is revolved about the x-axis.

We can take the principal square root of both sides to acquire our function:

y=f(x)=\sqrt{4ax}

Please refer to the attachment below for the sketch.

The area of a surface of revolution is given by:

\displaystyle S=2\pi\int_{a}^{b}r(x)\sqrt{1+\big[f^\prime(x)]^2} \,dx

Where <em>r(x)</em> is the distance between <em>f</em> and the axis of revolution.

From the sketch, we can see that the distance between <em>f</em> and the AoR is simply our equation <em>y</em>. Hence:

r(x)=y(x)=\sqrt{4ax}

Now, we will need to find f’(x). We know that:

f(x)=\sqrt{4ax}

Then by the chain rule, f’(x) is:

\displaystyle f^\prime(x)=\frac{1}{2\sqrt{4ax}}\cdot4a=\frac{2a}{\sqrt{4ax}}

For our limits of integration, we are going from 0 to <em>h</em>.

Hence, our integral becomes:

\displaystyle S=2\pi\int_{0}^{h}(\sqrt{4ax})\sqrt{1+\Big(\frac{2a}{\sqrt{4ax}}\Big)^2}\, dx

Simplify:

\displaystyle S=2\pi\int_{0}^{h}\sqrt{4ax}\Big(\sqrt{1+\frac{4a^2}{4ax}}\Big)\,dx

Combine roots;

\displaystyle S=2\pi\int_{0}^{h}\sqrt{4ax\Big(1+\frac{4a^2}{4ax}\Big)}\,dx

Simplify:

\displaystyle S=2\pi\int_{0}^{h}\sqrt{4ax+4a^2}\, dx

Integrate. We can consider using u-substitution. We will let:

u=4ax+4a^2\text{ then } du=4a\, dx

We also need to change our limits of integration. So:

u=4a(0)+4a^2=4a^2\text{ and } \\ u=4a(h)+4a^2=4ah+4a^2

Hence, our new integral is:

\displaystyle S=2\pi\int_{4a^2}^{4ah+4a^2}\sqrt{u}\, \Big(\frac{1}{4a}\Big)du

Simplify and integrate:

\displaystyle S=\frac{\pi}{2a}\Big[\,\frac{2}{3}u^{\frac{3}{2}}\Big|^{4ah+4a^2}_{4a^2}\Big]

Simplify:

\displaystyle S=\frac{\pi}{3a}\Big[\, u^\frac{3}{2}\Big|^{4ah+4a^2}_{4a^2}\Big]

FTC:

\displaystyle S=\frac{\pi}{3a}\Big[(4ah+4a^2)^\frac{3}{2}-(4a^2)^\frac{3}{2}\Big]

Simplify each term. For the first term, we have:

\displaystyle (4ah+4a^2)^\frac{3}{2}

We can factor out the 4a:

\displaystyle =(4a)^\frac{3}{2}(h+a)^\frac{3}{2}

Simplify:

\displaystyle =8a^\frac{3}{2}(h+a)^\frac{3}{2}

For the second term, we have:

\displaystyle (4a^2)^\frac{3}{2}

Simplify:

\displaystyle =(2a)^3

Hence:

\displaystyle =8a^3

Thus, our equation becomes:

\displaystyle S=\frac{\pi}{3a}\Big[8a^\frac{3}{2}(h+a)^\frac{3}{2}-8a^3\Big]

We can factor out an 8a^(3/2). Hence:

\displaystyle S=\frac{\pi}{3a}(8a^\frac{3}{2})\Big[(h+a)^\frac{3}{2}-a^\frac{3}{2}\Big]

Simplify:

\displaystyle S=\frac{8\pi}{3}\sqrt{a}\Big[(h+a)^\frac{3}{2}-a^\frac{3}{2}\Big]

Hence, we have verified the surface area generated by the function.

Part B)

We have:

y^2=36x

We can rewrite this as:

y^2=4(9)x

Hence, a=9.

The surface area is 1000. So, S=1000.

Therefore, with our equation:

\displaystyle S=\frac{8\pi}{3}\sqrt{a}\Big[(h+a)^\frac{3}{2}-a^\frac{3}{2}\Big]

We can write:

\displaystyle 1000=\frac{8\pi}{3}\sqrt{9}\Big[(h+9)^\frac{3}{2}-9^\frac{3}{2}\Big]

Solve for h. Simplify:

\displaystyle 1000=8\pi\Big[(h+9)^\frac{3}{2}-27\Big]

Divide both sides by 8π:

\displaystyle \frac{125}{\pi}=(h+9)^\frac{3}{2}-27

Isolate term:

\displaystyle \frac{125}{\pi}+27=(h+9)^\frac{3}{2}

Raise both sides to 2/3:

\displaystyle \Big(\frac{125}{\pi}+27\Big)^\frac{2}{3}=h+9

Hence, the value of h is:

\displaystyle h=\Big(\frac{125}{\pi}+27\Big)^\frac{2}{3}-9\approx7.4614

8 0
3 years ago
Read 2 more answers
A teacher wrote a question on the board to which
xenn [34]

Answer:

23

Step-by-step explanation:

find 10% = 4

quadruple it = 16

half 10% = 2

half it again = 1

2.5% = 1

40% = 16

1 + 16 = 17

take 17 off of 40 = 23

8 0
3 years ago
Read 2 more answers
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