Step-by-step explanation:
3)= x + 57° = 140°
x = 140° - 57°
so, x = 83°
4)= x + 63° + 47° = 180°
or, x = 180° - 110°
so, x = 70°
Answer:
x = -7 or x = 1
Step-by-step explanation:
2x^2 + 4x - 7 = x^2 - 2x
x^2 + 6x - 7 = 0
(x + 7)(x - 1) = 0
x + 7 = 0 or x - 1 = 0
x = -7 or x = 1
Answer:
Step-by-step explanation:
<, > - open circle
≤, ≥ - closed circle
<, ≤ - draw the line to the left
>, ≥ - draw the line to the right
Answer:
Step-by-step explanation:
can be simplified to .
2 ÷ 2 = 1
------------
10 ÷ 2 = 5
Answer:
This is cluster sampling.
Step-by-step explanation:
American Airlines randomly selects 110 flights during a certain week and surveys all passengers on the flights.
This is a type of cluster sampling.
This type of sampling is done by dividing the population into different groups and a simple random sample of clusters is selected from the population.