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3 years ago

If x powered by 2= 20 what is the value of x ?

Mathematics

2 answers:

laila [671]3 years ago

8 0

Answer:

x = 10

Step-by-step explanation:

10^2= 20, therefore

Mashutka [201]3 years ago

3 0

Answer:

x = ± 2 $\sqrt{5}$

Step-by-step explanation:

Given

x² = 20 ( take the square root of both sides )

x = ± $\sqrt{20}$ = ± $\sqrt{4(5)}$ = ± $\sqrt{4}$ × $\sqrt{5}$ = ± 2 $\sqrt{5}$

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FIND V, W, X, Y <br><br><br> PLEASEEEE

RoseWind [281]

Answer:

see explanation

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180° , thus

w = 180° - (90 + 31) °= 180° - 121° = 59°

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5 0

3 years ago

Rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by the

Brut [27]

Answer:

The time that the rocket will hit the ground is 12.87 seconds.

Step-by-step explanation:

Given : The rocket is launched from a tower $y=-16x^2+199x+90$ . The height of the rocket, y in feet, is related to the time after launch, x in seconds, by the given equation.

To find : The time that the rocket will hit the ground ?

Solution :

When the rocket hit the ground i.e. height became zero y=0,

Equation is $y=-16x^2+199x+90$

Substitute y=0,

$-16x^2+199x+90=0$

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

$x=\frac{-(199)\pm\sqrt{(199)^2-4(-16)(90)}}{2(-16)}$

$x=\frac{-199\pm\sqrt{45361}}{-32}$

$x=\frac{-199+\sqrt{45361}}{-32},\frac{-199-\sqrt{45361}}{-32}$

$x=-0.43,12.87$

Reject negative value.

The time taken is 12.87 seconds.

5 0

3 years ago