Answer:
x = 704/39 ( <----Fraction)
Step-by-step explanation:
28 squared minus 39x minus 80 equals 0
784-39x-80=0 evaluate the power
704-39x=0 Subtract the numbers
-39x=-704 move the constant to the right hand side and change it's sign
Divide on both side to get x = 704/39
For 1:
Use pythagorean theorem because of the radius tangent theorem(point of contact = 90 degrees)
12 is the hypotenuse (the right angle points at the hypotenuse)
Therefore:
(9)^2 + (x)^2 = (12)^2
81 + x^2 = 144
Subtract 81 from both sides of the equation
x^2 = 63
Square root both sides to get rid of square on x and isolate the variable
The square root of 63 = 7.93 (roughly)
Answer:
D
Step-by-step explanation:
When the shape is a circle, its perimeter is called the
"circumference" of the circle.
The circumference of a circle is always (pi) times its
diameter.
(pi) is roughly 3.1416 . So if the diameter is 4 meters,
then the circumference is
12.5664... meters .
Rounded to the nearest hundredth, that's 12.57 meters.