Answer:
2
Step-by-step explanation:
x÷3 dư 1-->x=3a+1
y÷3 dư 2-->y=3b+2
x×y=(3a+1)×(3b+2)
=9ab+6a+3b+2
Mà 9ab, 6a, 3b chia hết cho 3, 2 chia 3 dư 1
==>x×y chia 3 dư 2
9514 1404 393
Answer:
57°
Step-by-step explanation:
TD is a diameter, so arc TCD is 180°. Then arc CD is ...
CD = arc TCD -arc TC
CD = 180° -123°
arc CD = 57°
Answer:
C
Step-by-step explanation:
If two events are independent, the probability of both happening are:
P(A and B) = P(A) × P(B)
In this case, if rain and lightening were independent:
P(rain and lightening) = P(rain) × P(lightening)
P(rain and lightening) = 0.45 × 0.45
P(rain and lightening) = 0.2025
However, we're told that P(rain and lightening) is 0.25, not 0.2025.
Since 0.2025 ≠ 0.25, the events are not independent, so they are dependent.
Answer: X=-3
Step-by-step explanation:
2(5x+3)-6x=7x+30+5x
10x+6-6x=7x+30+5x
4x-12x=30-6
-8x=24
-x=3
x=-3
Answer:B
Step-by-step explanation:
