Answer:
The area of the circle is 153.86 u²
And the expression is
a = π * (7 u)²
Step-by-step explanation:
To solve this problem we need to use the area formula of a circle:
a = area
r = radius = 7 units
π = 3.14
a = π * r²
we replace with the known values
a = π * (7 u)²
a = 3.14 * 49 u²
a = 153.86 u²
The area of the circle is 153.86 u²
Answer:
So, y = 2x + 7;
Then, 2x = 4( 2x + 7 ) - 16;
2x = 8x + 28 - 16;
2x = 8x + 12;
- 6x = 12;
x = - 2;
Then, y = 2· (-2) + 7;
y = - 4 + 7;
y = 3.
Step-by-step explanation:
Answer:
sq root of 6 divided by 2
Step-by-step explanation:
use pythagorean theorem: square of each leg equals the square of the hypotenuse
x squared plus x squared = radical three squared
2x² = 3
x² = 
x = square root of 3/2
rationalize the denominator to get sq root of 6 divided by 2
Hum, this problem was difficult. You use the next expression to solve this problem. \[\cos (A - B) = \cos A \cos B + \sin A \sin B \] \[\cos (A + B) = \cos A \cos B - \sin A \sin B\] \[\cos (A - B ) - \cos (A +B ) =2 \sin A \sin B\] So \[\sin A \sin B = 0.5 \left( \cos(A - B) - \cos(A + B) \right)\] A = 1.8 x, B = 0.5 x \[\sin (1.8x) \sin (0.5x) = 0.5\left( \cos(1.8-0.5)x - \cos(1.8+0.5)x \right)\]\[= 0.5 \left( \cos(1.3x) - \cos (2.3x) \right)\] It's finish !!
