When there is a minus before a parenthesis, you must change the sign of the number(s) inside the parenthesis.
(-9) - (-7) × [2 - (-9)]^2 + (-7)
-9 + 7 × [2 + 9]^2 - 7
- 9 + 7 * (11)^2 - 7
-9 + 7*121 - 7
-9 + 847 - 7
831
I can help you with one and 2 1hd 2 is 2d9
Answer:
هیرو فاینس تیفین nice profile pic
Step-by-step explanation:
Answer:
(a)
0.32
(b)
0.68
Step-by-step explanation:
It is given that a binomial experiment is carried out.
n = 4 trials
Probability of success, p = 0.25
We know that in a binomial experiment:
Probability of success + Probability of failure = 1
p + q = 1
So, q = 1 - 0.25 = 0.75
Probability of 'r' number of successes in 'n' trials of a binomial experiment is given as:

(a) P(r = 0) = ?
Putting values of x = 0, p and q:

(b) Find P(r ≥ 1) = ?
<em>Using complement rule:</em>
<em>P(r =0 ) + P(r ≥ 1) = 1</em>
0.32 + P(r ≥ 1) = 1
P(r ≥ 1) = 1 - 0.32
P(r ≥ 1) = 0.68
So, the answer are:
(a)
0.32
(b)
0.68
<h3>
Answer:</h3>
Sarah: 18
Brother: 24
<h3>
Step-by-step explanation:</h3>
The difference in ratio units is 4-3 =1. The difference in years is 6, so 1 ratio unit stands for 6 years.
Multiplying by 6, we have ...
... Sarah : Brother = 3·6 : 4·6 = 18 : 24
Sarah is 18; her brother is 24.