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zepelin [54]
2 years ago
15

I need help. Find the value of each variable.

Mathematics
2 answers:
azamat2 years ago
8 0

Answer:

x=8, y=4\sqrt{3}

Look up the 30-60-90 triangle rule

sweet-ann [11.9K]2 years ago
3 0

Answer:

x = 8, y = 4√3

Step-by-step explanation:

Use the 30-60-90 triangle.

Plug 4 in for x.

x = 2x = 2(4) = 8

y = x√3 = 4√3

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Answer:

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Step-by-step explanation:

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3 years ago
Sandra throws an object straight up into the air with initial velocity of 38 ft per square from platform that is 30 ft above the
expeople1 [14]

Answer:

3 seconds.

Step-by-step explanation:

We have been given that Sandra throws an object straight up into the air with initial velocity of 38 ft per second from platform that is 30 ft above the ground.

To find the time it will take for object to hit the ground, we will use formula:  

h(t)=-16t^2+v_0t+h_0, where, v_0 represents initial velocity and h_0 represents initial height.

Upon substituting our given initial velocity and initial height, we will get:

h(t)=-16t^2+38t+30

We know that object will hit the ground, when height will be 0, so we will equate object's height equal to 0 and solve for t as:

-16t^2+38t+30=0

Divide by 2:

-8t^2+19t+15=0

Upon using quadratic formula, we will get:

t=\frac{-b\pm\sqrt{b^2-4ac}}{2a}=\frac{-19\pm\sqrt{19^2-4(-8)(15)}}{2(-8)}

t=\frac{-19\pm\sqrt{361+480}}{-16}=\frac{-19\pm\sqrt{841}}{-16}

t=\frac{-19\pm29}{-16}

t=\frac{-19-29}{-16},t=\frac{-19+29}{-16}

t=\frac{-48}{-16},t=\frac{10}{-16}

t=3,t=-\frac{5}{8}

Since time cannot be negative, therefore, it will take 3 seconds for object to hit the ground.

7 0
3 years ago
Two times a number added to -4, subtracted from triple the sum of eight times the number and five
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Answer:

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defon
YoYo. 15/6 = 2.5 so each YoYo costs $2.50.
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