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3 years ago

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:

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

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:

First Problem

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.

Second Problem

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).

Third Problem

Refer to the second problem

Fourth Problem

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

$h(4.3)=-4.9(4.3)^2+32.7(4.3)$

$h(4.3)\approx50.01$

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

Fifth Problem

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