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3 years ago

Can someone help me with this please

Mathematics

1 answer:

TiliK225 [7]3 years ago

6 0

Answer:

-10

Step-by-step explanation:

f(3) just means plug the 3 in replace of x

f(3) = -4(3)+2

f(3)= -12+2

f(3)=-10

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True or False (& Justify): If a ball is thrown horizontally from the top edge of a 150m building at a speed of 25 m/sec, the

kap26 [50]

Answer:

38.6 m/s

Step-by-step explanation:

The motion of the ball is a projectile motion, which consists of two independent motions:

- A uniform motion (constant velocity) along the horizontal direction

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction

Therefore we have to analyze the horizontal and vertical motion separately.

Along the horizontal direction, the velocity is constant during the motion, since there are no forces acting in this direction. So the horizontal velocity 3 seconds after the launch will be the same as the velocity at the launch:

$v_x = v_0 = 25 m/s$

The vertical velocity instead changes according to the suvat equation:

$v_y = u_y - gt$

where

$u_y=0$ is the initial vertical velocity

$g=9.8 m/s^2$ is the acceleration due to gravity

t is the time

Therefore, after t = 3 s,

$v_y=0-(9.8)(3)=-29.4 m/s$

So the velocity after 3 seconds is < 25, -29.4 > m/s. The magnitude of the velocity is

$v=\sqrt{v_x^2+v_y^2}=\sqrt{25^2+(-29.4)^2}=38.6 m/s$

3 0

4 years ago

I will mark brainliest just answer right and fast pls<br>attached link

musickatia [10]

Answer:

9,0

Why?

Another way to identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis.

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3 years ago

A super hero action figure has a volume of 1500 cm³. The figure is dilated to create a store display. The volume of the dilated

geniusboy [140]

The scale factor is 30, since the size of the was increased by 30 times

Answer: 30:1

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3 years ago

A rectangular tank is 100 cm long, 30 cm wide and 12 cm deep.The volume of liquid it will hold is

Marina86 [1]

Answer:

36000cm

V= Length×Width×height

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3 years ago

Read 2 more answers

Find the area of each regular polygon below. Round values to the nearest 0.01. Show work for all steps clearly.

german

The area of the hexagon and pentagon area 779.4cm^2 and 84.303cm^2 respectively.

Data;

apothem = 15

<h3>Area of a Hexagon</h3>

The area of a hexagon with apothem 15 can be calculated by first finding the length of the side of the hexagon.

Length of hexagon can be found using trigonometric ratio;

$a = x\sqrt{3}$

Making x the subject of formula

$x = \frac{a}{\sqrt{3} }\\x = \frac{15}{\sqrt{3} }\\x = 8.660$

And then the length of the side is 2x

$s = 2 * 8660 = 17.32$

The perimeter of the hexagon is;

$p = 6s \\p = 6 * 17.32=103.92$

And the area is given as

$A = \frac{1}{2} * perimeter * apothem\\A = \frac{1}{2} * 103.92 * 15\\A = 779.4unit^2$

The area of the hexagon is 779.4 squared unit.

<h3>Area of the pentagon</h3>

The area of the pentagon can be found using several methods, but we can simply find the angle between the sides if we divide the pentagon into 10 pieces and then substitute the formula.

Total area of a pentagon is 360 degree.

$\theta = \frac{360}{10} = 36^0\\$

The area of a pentagon is given as

$A = \frac{5s^2}{4 tan \theta} \\A = \frac{5 * 7^2}{4* tan36} \\A = 84.303cm^2$

The area of the pentagon is 84.303cm^2

From the calculations above, the area of the hexagon and pentagon area 779.4cm^2 and 84.303cm^2 respectively

Learn more on area of polygons here;

brainly.com/question/1592439

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3 years ago