Answer:
Electric TV, Airplane, Refrigerator, Computer, Steel
Step-by-step explanation:
Answer:
Step-by-step explanation:
Since the chord is a tangent to the smaller circle, it will meet the radius of the smaller circle at right angle.
Let 
be the length of half of the chord. See diagram in attachment.
Then from Pythagoras Theorem,
We take the positive square root of both sides to obtain,
The length of the chord is
The correct answer is A
Answer:
It cost 30$
Step-by-step explanation:
Since 50% is 1/2 we put 80/2
so we have 40
25% is 1/4 we put 40/4=10 40-10=30
so the answer is 30
Answer:
- x = 4
- length = 19 ft
- width = 11 ft
Step-by-step explanation:
The area is given by the product of length and width.
A = LW
209 = (4x +3)(4x -5)
209 = 16x^2 -8x -15
224 = 16x^2 -8x
You could rearrange and use the quadratic formula at this point, but we elect to "complete the square".
14 = x^2 -(1/2)x
14 +1/16 = x^2 -1/2x +(1/4)^2 . . . . . add the square of half the x-coefficient
(x -0.25)^2 = 14.0625
x = 0.25 ± 3.75 . . . . . . take the square root; add 0.25
Only positive values of x are useful here, so we have
x = 4
Then the dimensions are ...
length = 4x +3 = 4(4) +3 = 19 . . . feet
width = 4x -5 = 16 -5 = 11 . . . feet
