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3 years ago

Plz help me step by step explanation would help for work plzzzz And Thank you PLEASE

Mathematics

2 answers:

lorasvet [3.4K]3 years ago

6 0

Answer:

r = -43. that's the result

AnnyKZ [126]3 years ago

3 0

Answer:

i hope this helps

Step-by-step explanation:

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Find the area of an equilateral triangle with apothem of 5cm.

Pani-rosa [81]

Answer:

16.64645cm²

Step-by-step explanation:

All of the angles are equal: A = B = C = 180/3 = 60°.

All of the sides are equal: a = b = c.

h = 5 cm, sin60 = h/a = 5/a, a = 5/sin60 = 5.77 cm.

Area = 1/2bh = 1/2 x 5.77 x 5.77 = 33.2929/2 = 16.64645cm²

6 0

4 years ago

Read 2 more answers

What is the slope of the graph of x - 2y = 8?<br> A. 0<br> B. 1/2 <br> C. 2<br> D. -1/2

BaLLatris [955]

Answer:

1/2

Step-by-step explanation:

-2y= 8-X

y= -4+X/2

y= X/2-4

recall that: y= mx+c

in the equation y= x/2+C

m=1/2

where m is your slope

7 0

3 years ago

A model rocket is launched directly upward at a speed of 50 meters per second from a height of 8 meters. The function f(t)=−4.9t

Gnoma [55]

Answer:

$t=\frac{-50 -\sqrt{(50)^2 -4(-4.9)(8)}}{2*(-4.9)}= 10.36$

$t=\frac{-50 +\sqrt{(50)^2 -4(-4.9)(8)}}{2*(-4.9)}= -0.158$

And since the time can't be negative we have that:

$t= 10.36 seconds$

So the answer for this case would be after 10.36 seconds the rocket will hit the ground

Step-by-step explanation:

For this case we have the function of the height in terms of the time givenby:

$h(t) = -4.9t^2 +50 t+8$

And we want to known when the rockect hit the ground and for this case we need to solve the equation $h=0$

$-4.9t^2 +50 t+8 =0$

And as we can see we have a quadratic equation like this one:

$ax^2 +bx+c$

Where: $a =-4.9 , b =50 c =8$

And the general solutions are given by:

$x =\frac{-b \pm \sqrt{b^2 -4ac}}{2a}$

If we replace the values that we have we got:

$t=\frac{-50 -\sqrt{(50)^2 -4(-4.9)(8)}}{2*(-4.9)}= 10.36$

$t=\frac{-50 +\sqrt{(50)^2 -4(-4.9)(8)}}{2*(-4.9)}= -0.158$

And since the time can't be negative we have that:

$t= 10.36 seconds$

So the answer for this case would be after 10.36 seconds the rocket will hit the ground

6 0

4 years ago

the average walking speed of a person is 4.8 kilometersper hour. estimate the number of kilometers could you walk in 3 hours?

Rus_ich [418]

14.4 Kilometers per hour.

6 0

3 years ago

A coordinate grid with one line labeled 3 y equals 2 x minus 9. The line passes through points at (0, negative 3) and (3, negati

Vlad1618 [11]

Answer:

Hence option b is correct.

( b. y = (2/3)x-3)

Step-by-step explanation:

Muriel says she has written a system of two linear equations that has an infinite number of solutions.

The first equation is given as:

3y= 2x -9.

This equation could also be written as:

y=(2/3)x-3

since we divide both side of the equation by 3.

" The system of equation is said to have infinite solution if both the equations represents the same line "

Hence, option b is correct.

( b. y = (2/3)x-3 )

Also sorry for the late response.

9 0

3 years ago

Plz help me step by step explanation would help for work plzzzz And Thank you PLEASE​

Plz help me step by step explanation would help for work plzzzz And Thank you PLEASE