Answer:
B. Choose a random sample of people from the local area and random times throughout the day and measure their blood sugar using both the wristband and standard blood test.
Step-by-step explanation:
This is because here we are using a sample that is not limited to one time(like lunch time as option 1), the blood reading are of the same person(unlike option 3) and is not biased due to selective sample collection(like patients in a hospital who normally will show a greater range of results)
Answer:
x = -2, y=1
Step-by-step explanation:
x-7y=-9---------------------equation 1
-x+8y=10-------------------equation 2
From equation 1, make x the subject of formula
x=7y-9----------------------equation 3
substituting x=7y-9 in equation 2,
-(7y-9)+8y=10
Expanding bracket
-7y+9+8y=10
Collecting like terms
8y-7y=10-9
y=1
substituting y=1 in 3
x=7(1)-9
x=7-9
x=-2
Answer:
-Z-18
Step-by-step explanation:
-2z+12-30+z
=-z-18
9: v=-2
X= 0
K=3
I hope this helps
