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Crank
3 years ago
5

I need a hack for khan academy you will be rewarded 15 points and brainliest if you are right

Mathematics
2 answers:
IrinaVladis [17]3 years ago
8 0

Answer:

you can get a account for free just put a random email in

Step-by-step explanation:

Rama09 [41]3 years ago
5 0

Answer:

I could just do it for you. Like your khan academy I don't know any hacks for it but I could just do your work.

Step-by-step explanation:

You might be interested in
A diagonal of a rectangle is 8cm and forms an angle measuring 30 with one side. Find the area of the rectangle. ​
tankabanditka [31]

Answer:

Arectangle=27.68cm (approximately)

Step-by-step explanation:

<em>in order to find the area of the rectangle first you need to find the measure of the length and width.</em>

since both of them aren't given ,use trigonometry to find the value of the length and width.

sin30°=opposite/hypotenuse

sin30°=opposite/8cm

opposite=sin30°*8cm. >sin30°=0.5

opposite=4cm

cos30°=adjacent/hypotenuse

cos30°=adjacent/8cm

adjacent=cos30°*8cm. cos30°=0.866

adjacent=6.92cm (approximate value)

Arectangle= bh

Arectangle=4cm*6.92cn

Arectangle=27.68cm

8 0
3 years ago
Please help! BRAINLIEST!
Jet001 [13]

2x - 2y = -12

4x - 7y = -15

Multiply the first equation by -2 to make the 2x the opposite of 4x:

2x - 2y = -12 x -2 = -4x + 4y = 24

Now add this to the second equation:

-4x + 4y = 24 + 4x - 7y = -15:

-3y = 9

Divide both sides by -3

y = 9 / -3

y = -3

Now you have Y, replace y in one of the equations and solve for x:

2x - 2(-3) = -12

2x +6 = -12

Subtract 6 from both sides:

2x = -18

Divide both sides by 2:

x = -18 /2

X = -9

Check:

2(-9) - 2(-3) = -12

-18 + 6 = -12 TRUE

4(-9) - 7(-3) = -15

-36 +21 = -15 TRUE

X = -9, y = -3

(-9,-3)

4 0
3 years ago
A speedboat traveling at a constant speed arrives at its destination in 35 minutes if it traveled 70 miles then what was the spe
dalvyx [7]

So speed = distance divided by time, therefore 70 miles divided by 35 minutes = 120mph. The speedboats speed was 120mph.

Hope this helps

6 0
3 years ago
Read 2 more answers
Write the equation of the line that is parallel to the line y= -2x+3 and goes through the point (3, -6).​
svetlana [45]

Answer:

y=-2

Step-by-step explanation:

because it's parallel --> a=-2

therefore we have y=-2x+b

the line goes through the point (3,-6) --> (-2).3+b=-6 --> b=0

3 0
3 years ago
PLEASE HELP!!! WILL MARK BRAINLIEST!! THX! A golfer hits a ball with an initial velocity of 32.7 m/s from the ground. Find the f
OLEGan [10]

Answer:

See below

Step-by-step explanation:

<u>First Problem</u>

The ball hits the ground when h(t)=0, therefore:

h(t)=-4.9t^2+v_0t+h_0

0=-4.9t^2+32.7t

0=t(-4.9t+32.7)

t=0 and t=\frac{32.7}{4.9}\approx6.67

Since the ball is in the air before it hits the ground, t=6.67 (seconds) is the more appropriate choice.

<u>Second Problem</u>

The maximum height of the ball is determined when t=-\frac{b}{2a}, therefore:

t=-\frac{b}{2a}

t=-\frac{32.7}{2(-4.9)}

t=-\frac{32.7}{-9.8}

t\approx3.34

This means that the height of the ball is at its maximum after 3.34 seconds:

h(t)=-4.9t^2+32.7t

h(3.34)=-4.9(3.34)^2+32.7(3.34)

h(3.34)\approx54.55

Thus, the answer is 54.55 (meters).

<u>Third Problem</u>

Refer to the second problem

<u>Fourth Problem</u>

<u />h(t)=-4.9t^2+32.7t<u />

<u />h(4.3)=-4.9(4.3)^2+32.7(4.3)<u />

<u />h(4.3)\approx50.01<u />

<u />

Therefore, the height of the ball after 4.3 seconds is 50.01 (meters).

<u>Fifth Problem</u>

The ball will be 24 meters off the ground when h(t)=24, therefore:

h(t)=-4.9t^2+32.7t

24=-4.9t^2+32.7t

0=-4.9t^2+32.7t-24

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

t=\frac{-32.7\pm\sqrt{(32.7)^2-4(-4.9)(-24)}}{2(-4.9)}

t_1\approx0.84

t_2\approx5.83

Therefore, the ball will be 24 meters off the ground after 0.84 (seconds) and 5.83 (seconds)

5 0
2 years ago
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