Answer:
is 20 is your answer I believe
X=3 and X=-7 . Hope this helps:)
Step-by-step explanation:
1. +2-(+3) also is equal to 2-3. answer is -1
2. +11+(-10) also is equal to 11-10. answer is 1
3. 3+(-5) is also equal to 3-5. answer is -2
4. 22-21= 1
5. -8-(-44) is also equal to -8+44. answer is 36
6. -12+6+3 answer is -3
7. 16+12 answer is 28
8. -36+36=0
9. -4 x 10= -40
10. -1 x -1= 1
11. 7 x -7= -49
12. -4/4= -1
13. -7 x -5=35
14. -10 x 8 = -80
15. -2 x -7 = 14
Key tips to remember
a negative+ a negative also known as a double negative is always added.
negative * negative always equals positive
negative * positive always equals negative
A(n)= 250 + (n)(0.03*250); $355
I can also explain this in depth in the comments if you wish.
Answer:
0.875
Step-by-step explanation:
Let the probability that Billy passes test 1 be P(A)
Let the probability that Billy passes test 2 be P(B)
P(A n B) = 0.7
P(A) = P(B)
Let them both be numerically x.
P(A) = P(B) = x
P(A') = P(B') = (1 - x)
Probability that he passes at least one test = 0.9
But (probability that he passes at least 1 test) = 1 - (Probabilty that he fails both tests)
Probability that he fails both tests = 1 - 0.9 = 0.1
P(A' n B')= 0.1
P(U) = P(A) - P(A n B) + P(B) - P(A n B) + P(A n B) + P(A' n B') = 1
x - 0.7 + x - 0.7 + 0.7 + 0.1 = 1
2x = 1 + 0.7 - 0.1 = 1.6
x = 0.8
P(A) = P(B) = 0.8
The conditional probability of Billy passing test 2 given the event that he passes test 1 = P(B|A) = P(A n B)/P(A) = (0.7/0.8)
P(B|A) = 0.875
Hope this helps!!!
