From A :50/hour. *x(hour)
From B : 30/hour *x(hour)
50 *x +30 *x =400
80 *x=400
x=5(hour)
Then the train from A will make 50 *5=250 miles
(These is fisik)
Answer:
the bottom one is 1/2 which is a equal so the bottom one
Circumference of a circle is : 2.π.R (R = Radius)
Circumference = 2.π.(7) = 14.π = 14 x 3.1416 = 43.98 in ≈ 44 in
Answer:
Step-by-step explanation:
Given that in a rural area, only about 30% of the wells that are drilled find adequate water at a depth of 100 feet or less.
The sample size n = 80
no of wells less than 100 feet deep=27
Sample proportion = 
a) Create hypotheses as

(Right tailed test)
p difference 
Std error of p = 
b) Assumptions: Each trial is independent and np and nq >5
c) Z test can be used.
Z= p diff/std error = 
p value = 0.233
d) p value is the probability for which null hypothesis is false.
e) Conclusion: Since p >0.05 we accept null hypothesis
there is no statistical evidence which support the claim that more than 30% are drilled.