The answer would be A. 220. Hope I could help!
Answer:
(a) P(sum is 8) = 1/20
(b) P(sum is 6 or less) = 3/10
(c) P(first number is 2 or the sum is 5) = 3/10
Step-by-step explanation:
(a)
The probability (P) of having 8 as the sum of the numbers is;
P(3 and 5) = 1/5 × 1/4 = 1/20
(b) Probability that the sum of the numbers is 6 or less.
P(sum is 6) = P(2 and 4) or P(1 and 5) = 1/20 + 1/20 = 1/10
P(sum is less than 6) = P(1 and 4) or P(1 and 3) or P(1 and 2) or P(2 and 3) = 1/20 × 4 = 1/5
P(sum is 6 or less) = 1/10 + 1/5 = 3/10
(c) The first number is 2 or the sum is 5
P(first number is 2) = 1 - P(first number is 1) - P(first number is 3) - P(first number is 4) - P(first number is 5) = 1 - 4(1/5) = 1/5
P(sum is 5) = P(1 and 4) or P(2 and 3) = 1/20 + 1/20 = 1/10
P(first number is 2 or sum is 5) = 1/5 + 1/10 = 3/10
Answer:
(x - 9)(x + 8)
Step-by-step explanation:
Given
x² - x - 72
Consider the factors of the constant term (- 72) which sum to give the coefficient of the x- term (- 1)
the factors are - 9 and + 8, since
- 9 × 8 = - 72 and - 9 + 8 = - 1, thus
x² - x - 72 = (x - 9)(x + 8)
Yes, if it exists, and reduce our fraction by dividing both numerator and denominator by it. GCF = 11, and get our simplified answer
