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mezya [45]
3 years ago
15

Can someone please answer this questions please answer it correctly and please show work please help me I need it please

Mathematics
1 answer:
Len [333]3 years ago
8 0

Answer:

29. A

30. B

31. B

32. A

34. B

38. A

Step-by-step explanation:

29. A. All possible answers

B-D Incorrect

30. $44.56 - $10 = $34.56

$34.56 ÷ $0.08 = 432

31. 0.7 × 4k = 2.8k

0.7 × -12 = -8.4

0.7 (4k - 12) = 2.8k - 8.4

32. A = Pi × Radius^2

Large circle = 380.13

Small circle = 201.06

Subtract 380.13 - 201.06 = 179.07

34. 42/500 = 8.4% = 1/12

38. There is a 0 percent chance. It is impossible.

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Mrs. Harris divided up her leftover Halloween candy to her three children. If each child received 9 pieces of candy, how many pi
Dennis_Churaev [7]
The answer is 27 I think
4 0
3 years ago
The position function of a particle moving along a coordinate line is given, wheresis in feet andtis in seconds.
Sati [7]

Answer:

a) s = (4-t)/(t^2+4)^2,   a(t) = (2t^3-24t)/(t^2+4)^3

b) s = 0.2ft, v = 0.12 ft/s,  a = -0.176 ft/s^2

c) t = 2s

d) slowing down for t < 2, speeding up for t > 2

e) 0.327 ft

Step-by-step explanation:

The position function of a particle is given by:

s(t)=\frac{t}{t^2+4},\ \ \ t\geq  0   (1)

a) The velocity function is the derivative, in time, of the position function:

v(t)=\frac{ds}{dt}=\frac{(1)(t^2+4)-t(2t)}{(t^2+4)^2}=\frac{4-t^2}{(t^2+4)^2}   (2)

The acceleration is the derivative of the velocity:

a(t)=\frac{dv}{dt}=\frac{(-2t)(t^2+4t)^2-(4-t^2)2(t^2+4)(2t)}{(t^2+4)^4}\\\\a(t)=\frac{(-2t)(t^2+4)-4t(4-t^2)}{(t^2+4)^3}=\frac{2t^3-24t}{(t^2+4)^3} (3)

b) For t = 1 you have:

s(1)=\frac{1}{1+4}=0.2\ ft\\\\v(1)=\frac{4-1}{(1+4)^2}=0.12\frac{ft}{s}\\\\a(1)=\frac{2-24}{(1+4)^3}=-0.176\frac{ft}{s^2}

c) The particle stops for v(t)=0. Then you equal equation (2) to zero ans solve the equation for t:

v(t)=\frac{4-t^2}{(t^2+4)^2}=0\\\\4-t^2=0\\\\t=2

For t = 2s the particle stops.

d) The second derivative evaluated in t=2 give us the concavity of the position function.

\frac{d^2s}{dt^2}=a(2)=\frac{2(2)^3-24(2)}{(2^2+4)^3}=-0.062

Then, the concavity of the position function is negative. For t=2 there is a maximum. Before t=2 the particle is slowing down and after t=2 the particle is speeding up.

e) Due to particle goes and come back. You first calculate s for t=2, then calculate for t=5.

s(2)=\frac{2}{2^2+4}=0.25\ ft

s(5)=\frac{5}{5^2+4}=0.172\ ft

The particle travels 0.25 in the first 2 seconds. In the following three second the particle comes back to the 0.172\ ft. Then, in the second trajectory the particle travels:

0.25 - 0.127 = 0.077 ft

The total distance is the sum of the distance of the two trajectories:

s_total = 0.25 ft + 0.077 ft = 0.327 ft

6 0
3 years ago
The coordinates of the vertices of △DEF are D(2,−1) , E(7,−1) , and F(2,−3) . The coordinates of the vertices of △D′E′F′ are D′(
inn [45]
One is a translation 2 units right but i don't know about the other one
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(?) what is the relationship between the 81 degree angle ? what is the measure of this angle ?
swat32

Answer:

<u>A.</u> They are corresponding and vertically opposite

<u>B.</u> <u>Rigid Motion:</u>

Any way of moving all the points in the plane such that. a) the relative distance between points stays the same and. b) the relative position of the points stays the same. There are four types of rigid motions that we will consider: translation , rotation, reflection, and glide reflection.

<u>C:</u> 81

Step-by-step explanation:

7 0
2 years ago
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You would use 3 3/8 - 1 2/8.
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