15 i think hope i could help
Answer:
A (3,-2)
Step-by-step explanation:
x = t-1
y = -sqrt(t)
Let t= 4
x = 4-1 = 3
t = -sqrt(4) = -2
The (x,y) coordinate is (3,-2)
Answer:
Method A.
Step-by-step explanation:
For solving this question we need to find out the z-scores for both methods,
Since, the z-score formula is,

Where,
is mean,
is standard deviation,
Given,
For method A,


Thus, the z score for 34 is,

While, for method B,


Thus, the z score for 34 is,
,
Since, 
Hence, method A is preferred if the procedure must be completed within 34 minutes.
4n/5-4/7=64/35
4n/5-20/35=64/35
4n/5=84/35
4n=12
n=3. Hope it help!
N equals negative 22 the work is above