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3 years ago

Need math help please!!

Mathematics

1 answer:

Eva8 [605]3 years ago

8 0

Answer:

Step-by-step explanation:

The fact that DE is perpendicular to AC means triangles AED and CED are congruent and side AD is equal in length to side CD.

5x -20 = 2x +4

3x = 24 . . . . . . . add 20-2x

x = 8 . . . . . . . . . .divide by 3

The value of x is 8.

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The radius of the base of a cylinder is decreasing at a rate of 121212 kilometers per second. The height of the cylinder is fixe

WARRIOR [948]

Answer:

7536 $km^3/sec$

Step-by-step explanation:

Given that:

Rate of decreasing of radius = 12 km/sec

Height of cylinder is fixed at = 2.5 km

Radius of cylinder = 40 km

To find:

The rate of change of Volume of the cylinder?

Solution:

First of all, let us have a look at the formula for volume of a cylinder.

$Volume = \pi r^2h$

Where $r$ is the radius and

$h$ is the height of cylinder.

As per question statement:

$r$ = 40 km (variable)

$h$ = 2.5 (constant)

$\dfrac{dV}{dt} = \dfrac{d}{dt}\pi r^2h$

As $\pi, h$ are constant:

$\dfrac{dV}{dt} = \pi h\dfrac{d}{dt} r^2\\\Rightarrow \dfrac{dV}{dt} = \pi h\times 2 r\dfrac{dr}{dt} \\$Putting the values:$\\\Rigghtarrow\dfrac{dV}{dt} = 3.14 \times 2.5\times 2 \times 40\times 12 \\\Rigghtarrow\dfrac{dV}{dt} = 7536\ km^3/sec$

4 0

3 years ago

Please help !!!!!!! Will mark brainliest for the correct answer !!!!!!!!

Sholpan [36]

Answer:

Step-by-step explanation:

-2m - 5n = 7m - 3n

-9m - 5n = -3n

-9m = -2n

m = 2n/9

g(m)= 2n/9

7 0

3 years ago

Read 2 more answers

Need help will give Brainly

asambeis [7]

Answer:

x = 323 in

Step-by-step explanation:

Given triangles are similar, so their corresponding sides would be in proportion:

3ft = 3*12 = 36 in

5ft 8 in = 5*12 + 8 = 68 in

14 ft 3 in = 14*12 + 3 = 171 in

$\frac{3 \: ft}{14 \: ft \: 3 \: in} = \frac{5 \: ft \: 8 \: in}{x} \\ \\ \frac{36}{171} = \frac{68}{x} \\ \\ x = \frac{171 \times 68}{36} \\ \\ x = \frac{11628}{36} \\ \\ x = 323 \: in \: \\ \\ x = 26 ft \: 11 in$

4 0

3 years ago

GIVING BRAINLIST Use the number line to answer the question. Each tick represents 1 unit.

vivado [14]

The answer is p , merry Christmas

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3 years ago

A professional diver began to descend at a rate of 9 feet per minute after jumping into the ocean at a depth of 7 feet. Which of

klemol [59]

See what you can do like ask what the change is

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3 years ago