At the beginning, the chances that the teacher will choose a student who has forgotten his lunch are 2/10, or 1/5.
If the teacher now chooses another student from the remaining 9 students, the chances of his choosing a student who has forgotten his lunch are 1/9, since one of the forgetful students has already been removed from the original group of 10 students, and there are only 9 in the group remaining.
The probability that both students forgot lunch is (1/5)(1/9), or 1/45.
To solve this problem, we need to know the formula of the surface area of a triangular prism. The formula is: A = 2
+ (a+b+c) * h
Now we can substitute values and solve
A = 2(0.5 * 4 * 3) + (3+4+5) * 20
A = 12 + 240
A = 252
That means that the answer to this question is 252 square feet.
Answer:
4 circles
Step-by-step explanation:
If you subract 3 squares from both sides, you end with 2 circles on the left and one square on the right. That is, 2 circles balance 1 square.
If you add 2 squares on the right, you need to add 2×2 = 4 circles on the left to balance them.
Answer:
80°
option b
Step-by-step explanation:
angle 1 is equal to angle 2 because they are alternate angles and alternate angles are always equal.
