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zaharov [31]
3 years ago
15

60 % of 80 ASAP pls bruuh

Mathematics
1 answer:
Sati [7]3 years ago
7 0

Answer:

48

Step-by-step explanation:

just ask siri

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Find+the+positive+value+for+α+if+the+radius+of+the+circle+3x^2+3y-6αx+12y-3α=0+is+4
Alik [6]

Answer:

\alpha=3

Step-by-step explanation:

<u>Equation of a Circle</u>

A circle of radius r and centered on the point (h,k) can be expressed by the equation

(x-h)^2+(y-k)^2=r^2

We are given the equation of a circle as

3x^2+3y^2-6\alpha x+12y-3\alpha=0

Note we have corrected it by adding the square to the y. Simplify by 3

x^2+y^2-2\alpha x+4y-\alpha=0

Complete squares and rearrange:

x^2-2\alpha x+y^2+4y=\alpha

x^2-2\alpha x+\alpha^2+y^2+4y+4=\alpha+\alpha^2+4

(x-\alpha)^2+(y+2)^2=r^2

We can see that, if r=4, then

\alpha+\alpha^2+4=16

Or, equivalently

\alpha^2+\alpha-12=0

There are two solutions for \alpha:

\alpha=-4,\ \alpha=3

Keeping the positive solution, as required:

\boxed{\alpha=3}

8 0
3 years ago
Please answer this question now
Alex787 [66]

Answer:

541.7 (m2)

Step-by-step explanation:

Applying the sine theorem:

WV/sin(X) = XV/sin(W)

=> WV = XV*sin(X)/sin(W) = 37*sin(50)/sin(63) = 31.81

Angle V = 180 - X - W = 180 - 50 - 63 = 67

Denote WH is a height of the triangle VWX, H lies on XV

=> WH = WV*sin(V) = 31.81*sin(67) =  29.28

=> Area of triangle VWX is calculated by:

S = side*height/2 = XV*WH/2 = 37*29.28/2 = 541.7 (m2)

8 0
3 years ago
Jen uses 8.6 gallons of gasoline to drive 164.7 miles. Which is the best estimate for thenumber of miles per gallon of gasoline
zimovet [89]

Answer:

C

Step-by-step explanation:

164.7/8.6 = 19.15

about 20 miles per gallon

4 0
3 years ago
What is the value of mc016-1.jpg?<br> -20<br> -4<br> 4<br> 20<br><br> the pic is the .jpg
storchak [24]

(4-2)^3 -3*4 =

(4-2) = 2, 2^3 = 8

3*4 =12

 so you have 8-12 = -4

 Answer is -4

4 0
3 years ago
Read 2 more answers
Find the measure of the missing angle
Alexus [3.1K]

Answer: 149° both

Step-by-step explanation:

The angle B and C are equal as they are on opposite sides.

Angle B and C is equal to 180 - 31 = 149 due to the straight line rule

5 0
1 year ago
Read 2 more answers
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