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3 years ago

What is 2/-4 simplified

Mathematics

2 answers:

pickupchik [31]3 years ago

8 0

Answer:

-0.5 is the answer I think

PolarNik [594]3 years ago

4 0

Answer: 1/-2

Step-by-step explanation:

Because half of 2/-4 is 1/-2 simplyed.

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In a murder investigation, the temperature of the corpse was 32.5°C at 1:30 pm and 30.3°C an hour later. Normal body temperature

wolverine [178]

Answer:

Step-by-step explanation:

Given that in a murder investigation, the temperature of the corpse was 32.5°C at 1:30 pm and 30.3°C an hour later.

Normal body temperature is 37.0°C and the temperature of the surroundings was 20.0°C.

As per Newton law of cooling we have

$T(t) = T_s+(T_0-T_s)e^{-kt}$

is the temperature at time t.

Substitute this for given two information to find k and T0

$32.5 = 20+(37-20)e^{-kt} \\30.3 = 20+(37-20)e^{-k(t+1)}$

$12.5 = (17)e^{-kt} ...i\\10.3 =17e^{-k(t+1)}...ii$

Divide I equation by II to get

$1.2136=e^k\\k = 0.1936$

Using this we find t at 1.30 p.m.

$32.5 = 20+(37-20)e^{-0.1936t} \\\\0.7353=e^{-0.1936t} \\t= 1.588$

i.e. approximately 1.6 hours or 1 hour 36 minutes lapsed at 1.30

Time of murder is

11 hrs 54 minutes.

4 0

3 years ago

What is the circumference of this circle?

Cerrena [4.2K]

Answer:

12.5663

Step-by-step explanation:

circumference = pi x diameter

d= 2r

d = (2)2

d=4

c=4pi

c=12.5663

4 0

3 years ago

Read 2 more answers

50 POINTS SOMEONE PLEASE HELP WHATS 2+2 A.) 4 B.) 2 C.)5 D.) 1230

Semenov [28]

Answer:

2+2=4

Step-by-step explanation:

6 0

3 years ago

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Consider an angle in standard position with r = 12 centimeters, as shown in the figure. Write a short paragraph describing the c

11Alexandr11 [23.1K]

x decreases from 12 to 0
y increases from 0 to 12
sine increases from 0 to 1
cosine decreases from 1 to 0
tangent increases from 0 to infinity

6 0

4 years ago

Alejandra, the soccer player, runs 12 meters and kicks the ball into the air. It lands 20 meters away from her. 2

vodomira [7]

Answer:

The focus of the parabola is (10, 10.0 $\overline 5$ )

The directrix of the parabola is, y = 1.0 $\overline 5$

The maximum height reached by the ball = 5. $\overline 5$ meters

The vertex of the parabola is (10, 5. $\overline 5$ )

Step-by-step explanation:

The general equation of a parabola is y = a·(x - h)² + k

The vertex of the parabola = (h, k)

At 2 meters (horizontal) before landing, the height, h = 2 meters

∴ We have;

2 = a·(2 - h)² + k

2 = a·(18 - h)² + k

(2 - h)² = (18 - h)²

h² - 4·h + 4 = h² - 36·h + 324

36·h - 4·h = 324 - 4

h = 320/32 = 10

h = 10

2 = ut -0.5×9.81×t²

The

The time it takes the ball to fall 2 meters =

y = a·x² + b·x + c

h = -b/(2·a)

At y = 0, x = 0, therefore, c = 0

2 = a·2² + b·2 + c = 4·a + 2·b

2 = 324·a + 18·b

k = a·10² + b·10

20·a = -b

k = 100·a - 200·a = -100·a

2 = a·(2 - 10)² + k = 64·a + k

2 = 64·a + k = 64·a - 100·a = -36·a

a = 2/(-36) = -1/18

a = -1/18

a = 1/(4·p)

∴ 4·p = -18

p = 18/4 = 4.5

The focus of the parabola = (h, k + p) = (10, 10.0 $\overline 5$ )

The directrix, y = k - p = 1.0 $\overline 5$

k = 100× -1/18 = 5. $\overline 5$

The maximum height reached by the ball = 5. $\overline 5$ meters

The vertex of the parabola = (10, 5. $\overline 5$ )

8 0

3 years ago

What is 2/-4 simplified​

What is 2/-4 simplified