Answer:
A platonic solid is a three-dimensional shape whose faces are all the same shape and whose corners are the meeting place of the same number of polygons.
Step-by-step explanation:
Step-by-step explanation:
Draw the triangle formed by the ray.
The hypotenuse of the triangle is:
c² = a² + b²
c² = (-5)² + (2√7)²
c² = 25 + 28
c = √53
Therefore:
cos β = -5 / √53
Or, as a proper fraction:
cos β = -5√53 / 53
Answer:
4
Step-by-step explanation:
Answer:
The answer is b.)
Step-by-step explanation:
There are 38 slots in which the ball can land .
2 of the slots are green
18 of the slots are red
18 of the slots are black
The wheel is spun twice. The outcome of both the spins are independent of each other.
Therefore the probability, p(ball lands on red the first time and black the second time)
= p( ball lands on any one of 18 red slots) × p(ball lands on any one of 18 black slots)
=
The answer is b.)