Answer:
Bernie left home riding his bike at a rate of 15 mph.
Charlie left one hour later biking at a rate of 20 mph.
Bernie distance = 15*t (time is represented by t)
Charlie distance = 20*(t-1) (he left after 1 hour)
15t = 20t - 20
-5t = -20
t = 4
4*15 = 60
when t = 3 hours
3*20 = 60
Answer:
In a sample of 1000 test the expected number of false negatives is 8.6.
Step-by-step explanation:
The table provided is:
Positive Negative TOTAL
Hepatitis C 335 10 345
No Hepatitis C 2 1153 1155
TOTAL 337 1163 1500
A false negative test result implies that, the person's test result for Hepatitis C was negative but actually he/she had Hepatitis C.
Compute the probability of false negative as follows:
Compute the expected number of false negatives in a sample is <em>n</em> = 1000 tests as follows:
E (False negative) = <em>n</em> × P (Negative|No Hepatitis C)
Thus, in a sample of 1000 test the expected number of false negatives is 8.6.
Step-by-step explanation:
let the number be x
1/2(x) - 1/6(x) =10 -1/8(x)................this is the equation
1/12(x) + 1/8(x)=10
5/24(x)=10
cross multiply
5x= 240
x=240/5
x=48
Answer:
Step-by-step explanation:
I think 21 and 42
Answer:
-13
Step-by-step explanation:
6-7 x 6+7
-1 x 13
-13